Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials.
| Contraindication | Explanation | Alternative suggestions |
|---|---|---|
| Use with nitrates | Can cause dangerous drop in blood pressure | Seek medical advice for ED treatments |
| Severe cardiovascular disease | Increased risk during sexual activity | Assess cardiovascular health beforehand |
| Liver impairment | Altered drug metabolism | Dose adjustment or alternative therapy |
| Retinitis pigmentosa | Potential risk linked to PDE inhibitors | Consult eye specialist |
This effect was not observed with istradefylline 20 mg/day.
Consider dose reduction of sensitive CYP3A4 substrates.
haloperidolhaloperidol and vardenafil both increase QTc interval. haloperidol and vardenafil both increase QTc interval. hydrocortisonehydrocortisone will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. hydrocortisone will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. hydroxyzinehydroxyzine and tadalis oral jelly vardenafil both increase QTc interval.
hydroxyzine and vardenafil both increase QTc interval. ibrexafungerpibrexafungerp will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors imatinibimatinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors imatinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors Drugs that are known to prolong the QTc interval may have an increased the risk of ventricular arrhythmias. istradefylline will increase the level or effect
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of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
fludrocortisone will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. fluvoxaminefluvoxamine will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fluvoxamine will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fosamprenavirfosamprenavir will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fosamprenavir will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fosaprepitantfosaprepitant will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fosaprepitant will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be super p force online reduced if coadministered with moderate or strong CYP3A4 inhibitors fosfomycinfosfomycin and vardenafil both increase QTc interval. The risk of QT prolongation may increase in patients with electrolyte abnormalities (such as hypokalemia and hypocalcemia), patients with conditions that have potential to cause electrolyte imbalance (such as renal impairment), or patients taking other drugs affecting electrolyte balance or QT prolongation; avoid this drug in patients with known QT prolongation or ventricular arrhythmias, including a history of torsade de pointes; monitor electrolytes during treatment fosfomycin and vardenafil both increase QTc interval. The risk of QT prolongation may increase in patients with electrolyte abnormalities (such as hypokalemia and hypocalcemia), patients with conditions that have potential to cause electrolyte imbalance (such as renal impairment), or patients taking other drugs affecting electrolyte balance or QT prolongation; avoid this drug in patients with known QT prolongation or ventricular arrhythmias, including a history of torsade de pointes; monitor electrolytes during treatment fosphenytoinfosphenytoin will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
fosphenytoin will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. fostamatinibfostamatinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fostamatinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fostemsavirvardenafil and fostemsavir both increase QTc interval. QTc prolongation reported with higher than recommended doses of fostemsavir. itraconazoleitraconazole will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
vardenafil and fostemsavir both increase QTc interval. gemifloxacingemifloxacin and vardenafil both increase QTc interval. gemifloxacin and vardenafil both increase QTc interval. gepirone and vardenafil both increase QTc interval. gepotidacingepotidacin increases levels of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
If possible, avoid with sensitive substrates that are are extensively metabolized by CYP3A4 and have a narrow therapeutic index. If unable to avoid, monitor or modify substrate dose according to its prescribing information. gepotidacin increases levels of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. gilteritinib and vardenafil both increase QTc interval. granisetrongranisetron and vardenafil both increase QTc interval.
granisetron and vardenafil both increase QTc interval. grapefruitgrapefruit will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. grapefruit will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. griseofulvingriseofulvin will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. griseofulvin will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. itraconazole will increase the level or effect
of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
escitalopram increases toxicity of vardenafil by QTc interval. eslicarbazepine acetate will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Transient decrease in heart rate and AV conduction delays may occur when initiating etrasimod. Owing to potential of additive effect on heart rate, etrasimod may increase risk of QT prolongation and Torsades de Pointes when coadministered with Class Ia or Class III antiarrhythmic drugs, or other drugs that prolong the QT interval. etravirineetravirine will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
etravirine will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. fedratinibfedratinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fedratinib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fexinidazolefexinidazole will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fexinidazole will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fingolimodfingolimod and vardenafil both increase QTc interval. fingolimod and vardenafil both increase QTc interval. fluconazolefluconazole will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fluconazole will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors fludrocortisonefludrocortisone will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. ivacaftorivacaftor will increase the level or effect
| Aspect | Description | Typical Dosage | Onset Time | Duration of Action |
|---|---|---|---|---|
| Vardenafil 5 mg | A medication used to treat erectile dysfunction | 5 mg | 30-60 min | Up to 4-5 hours |
| Pharmacological Class | Phosphodiesterase type 5 inhibitor | N/A | N/A | N/A |
| Brand Names | Levitra, Staxyn (dissolvable film) | N/A | N/A | N/A |
of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.
Drugs that are known to prolong the QTc interval may have an increased the risk of ventricular arrhythmias. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors isavuconazonium sulfate will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors isoniazidisoniazid will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors isoniazid will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors istradefyllineistradefylline will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism.