Vardenafil Drug Profile

What is Vardenafil?

Vardenafil is a prescription medication belonging to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It is primarily used to treat erectile dysfunction (ED) in men by improving blood flow to the penis during sexual arousal. The medication works by relaxing smooth muscle and increasing blood circulation in specific areas of the body.

Uses

Vardenafil has several documented medical applications:

• Erectile dysfunction: The primary FDA-approved use, helping men achieve and maintain erections sufficient for sexual activity
• Pulmonary arterial hypertension: In some formulations, used to treat high blood pressure in the arteries of the lungs
• Benign prostatic hyperplasia symptoms: May help reduce urinary symptoms associated with enlarged prostate when used with other medications
• Raynaud’s phenomenon: Off-label use to improve blood circulation in fingers and toes
• Altitude sickness prevention: Investigational use to prevent high-altitude pulmonary edema by improving circulation

How it works

Vardenafil blocks the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down a chemical called cyclic GMP. By inhibiting this enzyme, vardenafil allows cyclic GMP levels to remain elevated, leading to relaxation of smooth muscle cells in blood vessel walls. This results in increased blood flow to targeted areas, particularly the penis during sexual stimulation, enabling improved erectile function.

Side effects

Common side effects:

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• Headache
• Facial flushing
• Nasal congestion
• Indigestion or upset stomach
• Dizziness
• Back pain
• Nausea
• Vision changes (mild color distortion)

Serious side effects requiring immediate medical attention:

• Sudden vision loss or severe vision changes
• Sudden hearing loss or ringing in ears
• Chest pain or irregular heartbeat
• Prolonged erection lasting more than 4 hours (priapism)
• Severe drop in blood pressure causing fainting

Warnings and precautions

• Cardiovascular conditions: Men with serious heart problems, recent heart attack, stroke, or uncontrolled blood pressure should avoid vardenafil or use it only under close medical supervision
• Nitrate medications: Never combine with nitrate drugs (nitroglycerin, isosorbide) as this can cause a dangerous drop in blood pressure
• Liver and kidney impairment: Dosage adjustments may be necessary for patients with moderate to severe liver or kidney disease
• Eye conditions: Patients with retinitis pigmentosa or history of vision problems should use caution
• Not for women: Vardenafil is not approved for use in women or children under 18 years of age

Interactions

• Nitrates: Dangerous blood pressure drop; absolutely contraindicated with nitroglycerin, isosorbide mononitrate, or dinitrate
• Alpha-blockers: Enhanced blood pressure lowering effects with medications like doxazosin, tamsulosin
• Antifungal medications: Ketoconazole and itraconazole can significantly increase vardenafil blood levels
• HIV protease inhibitors: Ritonavir, indinavir, and similar drugs may increase vardenafil concentrations
• Antibiotics: Erythromycin and clarithromycin can enhance vardenafil effects
• Grapefruit juice: May increase drug levels and side effects
• Other PDE5 inhibitors: Should not be combined with sildenafil, tadalafil, or similar medications
• Blood pressure medications: May enhance hypotensive effects of various antihypertensive drugs

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Dosage

For erectile dysfunction, the typical starting dose is 10 mg taken approximately 1 hour before sexual activity, with or without food. The dose may be adjusted based on effectiveness and tolerance, ranging from 5 mg to 20 mg as needed. The maximum recommended frequency is once per day. For patients over 65 years of age or those with liver impairment, a lower starting dose of 5 mg is typically recommended. Dosage should always be determined and monitored by a qualified healthcare provider based on individual medical conditions and response to treatment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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