Generic versions of this low-dose form of sildenafil have been available in the U. On 6 May , Pfizer , which manufactures Viagra, told the Associated Press they will begin selling the drug directly to people on its site. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Your doctor will tell you not to take sildenafil if you are taking street drugs containing nitrates. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Ask your pharmacist for a list of the ingredients. · Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual activity. Do not take Viagra more than once per day. Shake the oral suspension (liquid) before you measure a dose. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon). Sildenafil is a generic drug, which is an exact copy of the active drug in a brand-name medication. The generic is considered to be as safe and effective as the original drug. And generics tend to. Sildenafil is available through Hims by prescription in , , mg pills starting at $4 per dose. Brand-name Viagra is also available through Hims in , , mg pills starting at $
