Viagra (sildenafil) is used for the treatment of erectile dysfunction. It is a phosphodiesterase-5 (PDE5) inhibitor. Common side effects of Viagra include facial flushing, headaches, stomach pain, nasal congestion, nausea, diarrhea, and an inability to differentiate between the colors green and blue. Loss of hearing, ringing in the ears and dizziness may occur. The recommended dose of Viagra is 25-100 mg taken 30 minutes to 4 hours before sexual activity. Viagra increases the effects of blood pressure lowering medications. It also increases the blood pressure lowering effects of nitrates (for example, isosorbide dinitrate) that are used primarily for treating angina. Patients taking nitrates should not receive Viagra.
Viagra should not be combined with Revatio or other PDE5 inhibitors (for example, Levitra [vardenafil], Cialis [tadalafil]). Tagamet (cimetidine), erythromycin, ketoconazole, Sporanox (itraconazole), and Posicor (mibefradil) can cause marked increases in the amount of Viagra in the body. Patients taking these medications should be observed carefully if Viagra is used. Our Viagra Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
Viagra in Detail - Patient Information: Side Effects Get emergency medical help if you have any of these signs of an allergic reaction: These may inclde:
- difficulty breathing;
- swelling of your face, lips, tongue, or throat.
- During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away.
- sudden vision loss;
- ringing in your ears, or sudden hearing loss;
- chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;
- irregular heartbeat;
- swelling in your hands, ankles, or feet; shortness of breath;
- vision changes; feeling light-headed, fainting;
- penis erection that is painful or lasts 4 hours or longer.
Less serious side effects may include: warmth or redness in your face, neck, or chest; stuffy nose; headache; memory problems; upset stomach; or back pain. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
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