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In this Article

• What is sildenafil (Viagra)?
• What are the possible side effects of sildenafil (Viagra)?
• What is the most important information I should know about sildenafil (Viagra)?
• What should I discuss with my healthcare provider before taking sildenafil (Viagra)?
• How should I take sildenafil (Viagra)?
• What happens if I miss a dose (Viagra)?
• What happens if I overdose (Viagra)?
• What should I avoid while taking sildenafil (Viagra)?
• What other drugs will affect sildenafil (Viagra)?
• Where can I get more information?

What happens if I miss a dose (Viagra)?

Viagra is used as needed, so you are not likely to be on a dosing schedule.

If you miss a dose of Revatio, take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose (Viagra)?

Seek emergency medical attention if you think you have used too much of this medicine. Overdose symptoms may include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting.

What should I avoid while taking sildenafil (Viagra)?

Avoid drinking alcohol, which can increase some of the side effects of sildenafil.

Avoid using other medicines to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without first talking to your doctor.

What other drugs will affect sildenafil (Viagra)?

Do not take sildenafil if you are also using a nitrate drug for chest pain or heart problems, including nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket), or recreational drugs such as amyl nitrate or nitrite ("poppers").

Before taking sildenafil, tell your doctor about all other medications you use for erectile dysfunction, or if you are using any of the following medications:

• bosentan (Tracleer);
• cimetidine (Tagamet, Tagamet HB);
• conivaptan (Vaprisol);
• diclofenac (Arthrotec, Cataflam, Voltaren, Flector Patch, Solareze);
• enoxacin (Penetrex);
• imatinib (Gleevec);
• isoniazid (for treating tuberculosis);
• rifampin (Rifadin, Rimactane);
• an antidepressant such as nefazodone;
• an antibiotic such as clarithromycin (Biaxin), dalfopristin/quinupristin (Synercid), erythromycin (E.E.S., EryPed, Ery-Tab, Erythrocin), or telithromycin (Ketek);
• an antifungal medication such as clotrimazole (Mycelex Troche), itraconazole (Sporanox), ketoconazole (Nizoral), or voriconazole (Vfend);
• heart or blood pressure medication such as diltiazem (Cardizem, Dilacor, Tiazac), doxazosin (Cardura), nicardipine (Cardene), quinidine (Quinaglute, Quinidex, Quin-Release), or verapamil (Calan, Covera, Isoptin, Verelan); or
• HIV/AIDS medicine such as amprenavir (Agenerase), atazanavir (Reyataz), delavirdine (Rescriptor), fosamprenavir (Lexiva), indinavir (Crixivan), nelfinavir (Viracept), saquinavir (Invirase), or ritonavir (Norvir).

This list is not complete and there may be other drugs that can interact with sildenafil. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about sildenafil.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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