Based upon measurements of sildenafil in semen of healthy volunteers 90 minutes after dosing, less than 0. Some people may also have ringing in their ears tinnitus or dizziness. You can take sildenafil with or without food. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Dosing The dose of this medicine will be different for different patients. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. Taking sildenafil alone will not cause an erection.Online Doctors for Viagra. Compare, research and select an online doctor. No insurance necessary without leaving your home. Get seen virtually, treated and receive . What to consider. Cost. Overdose. Ask your doctor. Q&A. Drug Images. What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that . About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when.

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