To ensure the safe use of Viagra (sildenafil), let your doctor know if you have a history or suffer from any of these conditions:
Coronary artery disease
Heart rhythm problems
Low or high blood pressure
Kidney or liver disease
Blood cell disorder such as multiple myeloma or sickle cell anemia
Physical deformity of your penis
If you have been instructed not to engage in sexual activity for health reasons
Take Viagra (sildenafil) as prescribed. Do not take a smaller or larger dose or for a longer period than recommended.
You should take Viagra 30 to 60 minutes before sexual activity. An erection will not occur just by taking the pill. You will need sexual stimulation to achieve an erection. The effects of Viagra will remain active for up to 4 hours. Only take one dose of Viagra a day.
FDA Pregnancy Classification
Viagra (sildenafil) is not indicated for use in women. However, this medicine is not expected to cause any harm to an unborn or breastfeeding baby. It is also unknown if sildenafil can pass into breast milk.
Store at room temperature and away from heat and moisture and out of the reach of children.
Sudden vision loss
Heart attack symptoms
Erection that last for more than 4 hours
Ringing in the ears or hearing loss
Shortness of breath
Let your doctor know of all the medicines you are using before a prescription is given. Some drugs have a serious interaction with Viagra (sildenafil). You must never combine Viagra with nitrate drugs used in the treatment of chest pains, and heart problems. Combing sildenafil with nitrate based drugs will cause a sudden and serious drop in blood pressure.
When using Viagra, seek emergency medical help if you have an erection that last for more than 4 hours. Prolonged erection (priapism) can cause damages to your penis. You must also stop using Viagra if you experience sudden vision loss.
If you feel dizzy, nauseated or experience numbness, pain or tingling in the chest, neck, arms, or jaw during sexual activity, stop immediately and contact your doctor. These are signs of serious side effects.
Viagra (sildenafil) has an interaction with 453 drugs.