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Pharmacologic and/or surgical therapy to effectively will happen at the drug in your body after about 4 hours. Its molecular structure is very similar they target: nucleoside reverse transcriptase inhibitors; non-nucleoside reverse.

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Vardenafil is not indicated for use in females and is therefore not recommended during breast-feeding. There is no information on the presence of vardenafil and its major metabolite in human milk, the

effects

on the breast-fed

infant

, or the effects on milk production. Vardenafil is excreted into the milk of lactating rats at concentrations approximately 10-fold greater than found in the plasma; following a single oral dose of 3 mg/kg, 3.3% of the administered dose was excreted into the milk within 24 hours. There is no known indication for the use of vardenafil in neonates, infants, or children. Vardenafil should not be prescribed to these populations.

Vardenafil should be used cautiously in patients with gastroesophageal reflux disease (GERD) or hiatal hernia associated with reflux esophagitis.

Like sildenafil, vardenafil can possibly decrease the tone of the lower esophageal sphincter and inhibit esophageal motility. Vardenafil should be administered to patients with coagulopathy only after careful benefit vs.

Vardenafil alone does not prolong the bleeding time nor does its use in combination with aspirin cause any additive prolongation of the bleeding time.

However, vardenafil has not been studied or administered to patients with bleeding disorders or significant active peptic ulcer disease. Therefore administer to these patients after careful benefit-risk assessment.

Patients with a sudden decrease or loss of hearing (hearing impairment) should stop taking vardenafil and seek prompt medical attention.

Hearing loss, which may be accompanied by tinnitus and dizziness, has been reported in temporal association with the intake of PDE5 inhibitors, including vardenafil; however, it is unknown if the hearing loss is directly related to PDE5 inhibitors or to other factors. The vardenafil orally disintegrating tablets contain aspartame, which is a source of phenylalanine. This may be harmful for people with phenylketonuria. The vardenafil orally disintegrating tablets contain sorbitol. Patients with hereditary fructose intolerance should not take the orally disintegrating tablets. anaphylactoid reactions / Rapid / 0-2.0 laryngeal edema / Rapid / 0-2.0 angioedema / Rapid / 0-2.0 seizures / Delayed / 0-2.0 ventricular tachycardia / Early / 0-2.0 myocardial infarction / Delayed / 0-2.0 visual impairment / Early / 0-2.0 hearing loss / Delayed / 0-2.0 non-arteritic anterior ischemic optic neuropathy / Delayed / Incidence not known. erythema / Early / 0-2.0 amnesia / Delayed / 0-2.0 hypertonia / Delayed / 0-2.0 esophagitis / Delayed / 0-2.0 gastritis / Delayed / 0-2.0 dysphagia / Delayed / 0-2.0 angina / Early / 0-2.0 hypertension / Early / 0-2.0 sinus tachycardia / Rapid / 0-2.0 orthostatic hypotension / Delayed / 0-2.0 chest pain (unspecified) / Early / 0-2.0 hypotension / Rapid / 0-2.0 palpitations / Early / 0-2.0 dyspnea / Early / 0-2.0 ejaculation dysfunction / Delayed / 0-2.0 conjunctivitis / Delayed / 0-2.0 photophobia / Early / 0-2.0 blurred vision / Early / 0-2.0 hyperemia / Delayed / 0-2.0 elevated hepatic enzymes / Delayed / 0-2.0 priapism / Early / Incidence not known QT prolongation / Rapid / sildenafil walgreens price

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Abarelix: (Major) Concomitant administration of vardenafil and abarelix may cause additive QT prolongation and should be used together cautiously.

Acetaminophen; Chlorpheniramine; Dextromethorphan; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Acetaminophen; Chlorpheniramine; Phenylephrine; Phenyltoloxamine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Acetaminophen; Dextromethorphan; Guaifenesin; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase

inhibitors

.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Acetaminophen; Dextromethorphan; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly. Acetaminophen; Guaifenesin; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly. Alfuzosin: (Moderate) Due to the potential for symptomatic hypotension, patients should be stable on alfuzosin therapy before initiating therapy with the lowest starting dose of vardenafil. Conversely, patients already receiving an optimized dose of vardenafil should be started on the lowest dose of alfuzosin; increases in the alpha-blocker dose should be done in a stepwise fashion.

Other variables, such as intravascular volume depletion, concurrent antihypertensive therapy, or evidence of hemodynamic instability with alpha-blocker monotherapy, may affect the safety of concomitant use of vardenafil and alfuzosin.

Concurrent use of these medications may also increase the risk for QT prolongation. Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval. Alfuzosin may prolong the QT interval sildenafil citrate 50mg price in a dose-dependent manner. Alpha-blockers: (Moderate) Due to the potential for symptomatic hypotension, patients should be stable on alpha-blocker therapy before initiating therapy with the lowest dose of vardenafil. Conversely, patients already receiving an optimized dose of vardenafil should be started on the lowest dose of the alpha-blocker; increases in the alpha-blocker dose should be done in a stepwise fashion.

Other variables, such as intravascular volume depletion, concurrent antihypertensive therapy, or evidence of hemodynamic instability with alpha-blocker monotherapy, may affect the safety of concomitant use of vardenafil

and

an alpha-blocker.

Amiodarone: (Major) The concomitant use of amiodarone and vardenafil should only be done after careful assessment of risks versus benefits, especially when the coadministered agent might decrease the metabolism of amiodarone.

Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produces an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction) The effect of vardenafil on the QT interval should be considered when prescribing the drug. Amiodarone, a Class III antiarrhythmic agent, is associated with a well-established risk of QT prolongation and torsades de pointes (TdP).

Although the frequency of TdP is less with amiodarone than with other Class III agents, amiodarone is still associated with a risk of TdP.

Due to the extremely long half-life of amiodarone, a drug interaction is possible for days cialis discount coupon cvs to weeks after discontinuation of amiodarone. Amiodarone is an inhibitor of CYP3A4 and can reduce vardenafil clearance.

Increased systemic exposure to vardenafil may result in an increase in vardenafil-induced adverse effects.

Amoxicillin; Clarithromycin; Lansoprazole: (Major) The manufacturer of clarithromycin (a CYP3A4 inhibitor) recommends against concomitant use with vardenafil (a CYP3A4 substrate); as use of these drugs together

will

result in increased vardenafil exposure.

If these drugs must be administered concurrently, use the regular tablet formulation of vardenafil at a dose not to exceed 2.5 mg every 24 hours.

The vardenafil orally disintegrating tablets provide increased exposure as compared to the regular tablets; therefore, use of the orally disintegrating tablets with moderate or potent CYP3A4 inhibitors is not advised. In addition, clarithromycin and vardenafil have been associated with prolongation of the QT interval; use of these drugs together may increase the risk for QT prolongation. Amoxicillin; Clarithromycin; Omeprazole: (Major) The manufacturer of clarithromycin (a CYP3A4 inhibitor) recommends

against

concomitant use with vardenafil (a CYP3A4 substrate); as use of these drugs together will result in increased vardenafil exposure. If these drugs must be administered concurrently, use the regular tablet formulation of vardenafil at a dose not to exceed 2.5 mg every 24 hours.

The vardenafil orally disintegrating tablets provide increased exposure as compared to the regular tablets;

therefore

, use of the orally disintegrating tablets with moderate or potent CYP3A4 inhibitors is not advised. In addition, clarithromycin and vardenafil have been associated with prolongation of the QT interval; use of these drugs together may increase the risk for QT prolongation.

Amyl Nitrite: (Severe) Coadministration of phosphodiesterase inhibitors

with

organic nitrates or nitrites in any dosage formulation is contraindicated.

Consistent with their known effects on the nitric oxide/cGMP pathway, concomitant use of phosphodiesterase inhibitors and nitrates can cause severe hypotension, syncope, or myocardial infarction.

Deaths have been reported in men who were using sildenafil while taking nitrate or nitrite therapy for angina.

Anagrelide: (Major) Torsades de pointes (TdP) and ventricular tachycardia have been reported during post-marketing use of anagrelide.

A cardiovascular examination, including an ECG, should be obtained in all patients prior to initiating anagrelide therapy.

Monitor patients during anagrelide therapy for cardiovascular effects and evaluate as necessary.

Drugs with a possible risk for QT prolongation and TdP that should be used cautiously and with close monitoring with anagrelide include vardenafil. Apomorphine: (Moderate) Exercise caution when administering apomorphine concomitantly with vardenafil as concurrent use may increase the risk of QT prolongation.

Limited data indicate that QT prolongation is possible with apomorphine administration; the change in QTc interval is not significant in most patients receiving dosages within the manufacturer's guidelines.

Vardenafil is also associated with QT prolongation at both therapeutic and supratherapeutic doses. Aprepitant, Fosaprepitant: (Moderate) Use caution if vardenafil and aprepitant, fosaprepitant are used concurrently sildenafil 25 mg coupon and monitor for an increase in vardenafil-related adverse effects for several days after administration of a multi-day aprepitant regimen. Aprepitant, when administered as a 3-day oral regimen (125 mg/80 mg/80 mg), is a moderate CYP3A4 inhibitor and inducer and may increase plasma concentrations of vardenafil. For example, a 5-day oral aprepitant regimen increased the AUC of another CYP3A4 substrate, midazolam (single dose), by 2.3-fold on day 1 and by 3.3-fold on day 5. After a 3-day oral aprepitant regimen, the AUC of midazolam (given on days 1, 4, 8, and 15) increased by 25% on day 4, and then decreased by 19% and 4% on days 8 and 15, respectively.

As a single 125 mg or 40 mg oral dose, the inhibitory effect of aprepitant on CYP3A4 is weak, with the AUC of midazolam increased by 1.5-fold and 1.

2-fold

, respectively.

After administration, fosaprepitant is rapidly converted to aprepitant and shares many of the same drug interactions. However, as a single 150 mg intravenous dose, fosaprepitant only weakly inhibits CYP3A4 for a duration of 2 days; there is no evidence of CYP3A4 induction.

Fosaprepitant 150 mg IV as a single dose increased the AUC of midazolam (given on days 1 and 4) by approximately 1.sildenafil 25 mg coupon 8-fold on day 1; there was no effect on day 4. Less than a 2-fold increase in the midazolam AUC is not considered clinically important. Aripiprazole: (Moderate) Use caution when administering aripiprazole with vardenafil due to increased risk of QT prolongation.

Vardenafil is associated with an increase in QTc interval at both therapeutic and supratherapeutic doses. QT prolongation has also occurred during therapeutic use of aripiprazole and following overdose.

Arsenic Trioxide: (Major) If possible, drugs that are known to prolong the QT interval should be discontinued prior to initiating arsenic trioxide therapy.

QT prolongation should be expected with the administration of arsenic trioxide. Torsade de pointes (TdP) and complete atrioventricular block have been reported. Drugs with a possible risk for QT prolongation and TdP that should be used cautiously with arsenic trioxide include vardenafil. Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produces an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

Artemether; Lumefantrine: (Major) Concurrent use of vardenafil and artemether; lumefantrine should be avoided due to an increased risk for QT prolongation and torsade de pointes (TdP).

Consider ECG monitoring if vardenafil must be used with or after artemether; lumefantrine treatment. Administration of artemether; lumefantrine is associated with prolongation of the QT interval.

Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil have also produced increases in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

Asenapine: (Major) Asenapine has been associated with QT prolongation. According to the manufacturer of asenapine, the drug should be avoided in combination with other agents also known to have this effect, such as vardenafil. Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produces an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction). When vardenafil (10 mg) was given with gatifloxacin (400 mg), an additive effect on the QT interval was observed. The effect of vardenafil on the QT interval should be considered when prescribing the drug.

Atazanavir: (Major) Particular caution should be used when prescribing vardenafil to patients receiving atazanavir. Coadministration of atazanavir with vardenafil is expected to substantially increase vardenafil plasma concentrations and may result in increased associated adverse events including hypotension, syncope, visual changes, and prolonged erection.

If coadministered, use vardenafil for erectile dysfunction at reduced doses of 2.5 mg, every 24 hours when used with atazanavir or every 72 hours when used with ritonavir-'boosted' atazanavir, with increased monitoring for adverse reactions. The vardenafil orally disintegrating tablets provide increased exposure as compared to the regular tablets; therefore, do not use the orally disintegrating tablets with moderate or potent CYP3A4 inhibitors, such as atazanavir. Atazanavir; Cobicistat: (Major) Particular caution should be used when prescribing vardenafil to patients receiving atazanavir.

Coadministration of atazanavir with vardenafil is expected to substantially increase vardenafil plasma concentrations and may result in increased associated adverse events including hypotension, syncope, visual changes, and prolonged erection. If coadministered, use vardenafil for erectile dysfunction at reduced doses of 2.5 mg, every 24 hours when used with atazanavir or every 72 hours when used with ritonavir-'boosted' atazanavir, with increased monitoring for adverse reactions.

The vardenafil orally disintegrating tablets provide increased exposure as compared to the regular tablets; therefore, do not use the orally disintegrating tablets with moderate or potent CYP3A4 inhibitors, such as atazanavir. (Major) When being administered with cobicistat, use vardenafil at reduced doses of no more than 2.5 mg every 72 hours with increased monitoring for adverse reactions. Coadministration of vardenafil with cobicistat is expected to substantially increase the plasma concentrations of vardenafil and may result in increased associated adverse events including hypotension, syncope, visual changes, and prolonged erection.

Atomoxetine: (Moderate) Consider the potential for additive QT effects if vardenafil is administered with atomoxetine as concurrent use may increase the risk of QT prolongation. QT prolongation has occurred during therapeutic use of atomoxetine and following overdose. Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval. Azithromycin: (Moderate) Due to an increased risk for QT prolongation and torsade de pointes (TdP), caution is advised when administering vardenafil with azithromycin.

Azithromycin has been associated with post-marketing reports of QT prolongation and TdP. Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval. Barbiturates: (Minor) Vardenafil is metabolized by

cytochrome

P450 3A4.

It can be expected that concomitant administration of CYP3A4 enzyme-inducers, such as barbiturates, will decrease plasma levels of vardenafil. Bedaquiline: (Major) Due to the potential for QT prolongation and torsade de pointes (TdP), caution is advised when administering bedaquiline with vardenafil. Bedaquiline has been reported to prolong the QT interval. Prior to initiating bedaquiline, obtain serum electrolyte concentrations and a baseline ECG.

An ECG should also be performed at least 2, 12, and 24 weeks after starting bedaquiline therapy. Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil also produce an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

Bepridil: (Severe) Concomitant administration of bepridil and vardenafil may cause additive QT prolongation and an increased risk of torsades de pointes (TdP). Bismuth Subcitrate Potassium; Metronidazole; Tetracycline: (Moderate) Consider the potential for additive QT effects if vardenafil is administered with metronidazole. Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval.

Potential QT prolongation has been reported in limited case reports with metronidazole.

Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval. Bismuth Subsalicylate; Metronidazole; Tetracycline: (Moderate) Consider the potential for additive QT effects if vardenafil is administered with metronidazole. Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval. Potential QT prolongation has been reported in limited case reports with metronidazole.

Both therapeutic and supratherapeutic doses of vardenafil produce an increase in QTc interval.

Boceprevir: (Moderate) Close clinical monitoring is advised when administering vardenafil with boceprevir due to an increased potential for vardenafil-related adverse events, such as hypotension, syncope, visual disturbances, and priapism.

During coadministration, do not exceed a maximum vardenafil dosage of 2.5 mg in 24 hours.

If vardenafil dose adjustments are made, re-adjust the dose upon completion of boceprevir treatment. Predictions about the interaction can be made based on the metabolic pathways of vardenafil. Vardenafil is a

substrate

of the hepatic isoenzyme CYP3A4; boceprevir inhibits this isoenzyme. When used in combination, the plasma concentrations of vardenafil may be elevated. Bosentan: (Minor) Vardenafil is metabolized by cytochrome P450 3A4.

It can be expected that concomitant administration of bosentan, a CYP3A4 enzyme-inducer, will decrease plasma levels of vardenafil, however, no interaction studies have been performed.

Brompheniramine; Carbetapentane; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Buprenorphine: (Major) Buprenorphine should be used cautiously and with close monitoring with vardenafil. Buprenorphine has been associated with QT prolongation and has a possible risk of torsade de pointes (TdP).

FDA-approved labeling cheap sildenafil tablets for some buprenorphine products recommend avoiding use with Class 1A and Class III antiarrhythmic medications while other labels recommend avoiding use with any drug that has the potential to prolong the QT interval, such as vardenafil.

Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produce an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

When vardenafil (10 mg) was given with gatifloxacin (400 mg), an additive effect on the QT interval was observed. If these drugs are used together, consider the potential for additive effects on the QT interval. Buprenorphine; Naloxone: (Major) Buprenorphine should be used cautiously and with close monitoring with vardenafil.

Buprenorphine

has been associated with QT prolongation and has a possible risk of torsade de pointes (TdP).

FDA-approved labeling for some buprenorphine products recommend avoiding use with Class 1A and Class III antiarrhythmic medications while other labels recommend avoiding use with any drug that has the potential to prolong the QT interval, such as vardenafil. Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produce an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

When vardenafil (10 mg) was given with gatifloxacin (400 mg), an additive effect on the QT interval was observed. If these drugs are used together, consider the potential for additive effects on the QT interval.

Carbamazepine: (Minor) Vardenafil is metabolized by cytochrome P450 3A4.

It can be expected that concomitant administration of CYP3A4 enzyme-inducers, such as carbamazepine, will decrease plasma levels of vardenafil, however, no interaction studies have been performed.

Carbetapentane; Chlorpheniramine; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents

are

administered concomitantly. Carbetapentane; Diphenhydramine; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Carbetapentane; Guaifenesin; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly. Carbetapentane; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these

agents

are administered concomitantly. Carbetapentane; Phenylephrine; Pyrilamine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly. Carbinoxamine; Hydrocodone; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Carbinoxamine; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Ceritinib: (Major) Due to increased

vardenafil

exposure, do not use vardenafil orally disintegrating tablets with ceritinib.

If possible, avoid concomitant use of vardenafil oral tablets with ceritinib due to the potential for prolongation of the QT interval and increased vardenafil exposure.

If concomitant use of ceritinib and vardenafil oral tablets is unavoidable, decrease the vardenafil dosage and periodically monitor ECGs and electrolytes. Vardenafil is a sensitive CYP3A4 substrate that can produce an increase in QTc interval at both therapeutic and supratherapeutic doses.

Ceritinib is a strong CYP3A4 inhibitor that has been reported to cause concentration-dependent QT prolongation. Coadministration with another strong CYP3A4 inhibitor increased the AUC and Cmax of vardenafil in healthy volunteers by 10-fold and 4-fold, respectively.

Chlophedianol; Guaifenesin; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly. Chloroquine: (Major) Chloroquine administration is over the counter sildenafil cvs associated with an increased risk of QT prolongation and torsades de pointes (TdP).

The need to coadminister chloroquine with drugs known to prolong the QT interval should be done with a careful assessment of risks versus benefits and should be avoided when possible.

Drugs with a possible risk for QT prolongation and TdP that should be used cautiously and with close monitoring with chloroquine include vardenafil. Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produces an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction). Chlorpheniramine; Dextromethorphan; Phenylephrine: (Moderate) The therapeutic

effect

of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor

effect

if these agents are administered concomitantly. Chlorpheniramine; Dihydrocodeine; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Chlorpheniramine; Hydrocodone; Phenylephrine: (Moderate) The therapeutic effect of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors.

Monitor patients for decreased pressor effect if these agents are administered concomitantly.

Chlorpheniramine; Phenylephrine: (Moderate) The therapeutic

effect

of phenylephrine may be decreased in patients receiving phosphodiesterase inhibitors. Monitor patients for decreased pressor effect if these agents are administered concomitantly. Chlorpromazine: (Major) Therapeutic (10 mg) and supratherapeutic (80 mg) doses of vardenafil produces an increase in QTc interval (e.g., 4 to 6 msec calculated by individual QT correction).

When vardenafil (10 mg) was given with gatifloxacin (400 mg), an additive effect on the QT interval was observed.

The effect of vardenafil on the QT interval should be considered when prescribing the drug. Drugs with a possible risk for QT prolongation and TdP that should be used cautiously with vardenafil include chlorpromazine. Phenothiazines have been associated with a risk of QT prolongation and/or torsade de pointes TdP.

This risk is generally higher at elevated drugs concentrations of phenothiazines.

Chlorpromazine is specifically associated with an established risk of QT prolongation and TdP; case reports have included patients receiving therapeutic doses of chlorpromazine.

Agents that prolong the QT interval could lead to torsade de pointes when combined with a phenothiazine, and therefore are generally not recommended for combined use.

Cimetidine: (Major) Phosphodiesterase inhibitors are metabolized principally by cytochrome P450 (CYP) 3A4 (major route) and 2C9 (minor route) isoenzymes.

Cimetidine is a

known

inhibitor of hepatic CYP enzymes.

Cimetidine (800 mg) caused a 56% increase in plasma sildenafil concentrations when coadministered with sildenafil 50 mg to healthy volunteers.

Population data from patients in clinical trials also indicate a reduction in sildenafil clearance when it was coadministered with cimetidine.

If possible, cimetidine use should be avoided in patients who take phosphodiesterase inhibitors Ciprofloxacin: (Moderate) Due to an increased risk for QT prolongation and torsade de pointes (TdP), caution is advised when administering ciprofloxacin with vardenafil.



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