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For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed.
Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors.
The erection usually starts within 10 minutes and, when effective, lasts between 30 and 60 minutes. Side effects can include a burning feeling in the penis, minor bleeding in the urethra and formation of fibrous tissue inside your penis.
For oral dosage form (tablets): Adults 65 years and older—5 milligrams (mg) as a single dose, no more than once per day, approximately 1 hour before sexual activity. Your doctor may adjust your dose if needed.
If you take tadalafil for pulmonary arterial hypertension, do not take Cialis® or other PDE5 inhibitors, including sildenafil (Revatio® or Viagra®) or vardenafil (Levitra®). Cialis® also contains tadalafil.
Adults—At first, 200 milligrams (mg) followed by 100 mg every 12 hours. Some patients may start at 2 or 4 capsules of 50 mg followed by one 50 mg capsule 4 times a day. Children 8 years of age and older—Dose is based on body weight and must be determined by your doctor.
For oral dosage form (tablets): For treatment of erectile dysfunction (as needed): Adults—At first, 100 milligrams (mg) as a single dose, no more than once a day, taken 15 minutes before sexual intercourse. Your doctor may adjust your dose if needed. However, the dose is usually not more than 200 mg once a day.
I've more or less settled on taking Sildenafil (Viagra) on an empty stomach about 90 minutes before a planned encounter and then eating something about an hour after taking it. I've been taking 60mg or 80mg -- have never tried 100mg. It's not clear to me that taking more makes a big difference.
Sildenafil injection is used to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs.
Not everyone can safely take oral medicine for erectile dysfunction. These medicines include avanafil (Stendra), sildenafil (Viagra), tadalafil (Cialis) and vardenafil. Oral medicine for ED might not work or might be dangerous if you already take: