Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. Viagra is not for use by females. Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. Please expect up to 4 to 6 weeks for reimbursement.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. Myth #4: Viagra improves sex drive. Viagra increases blood flow to your penis, which can help you get and maintain an erection for whatever activity you have in mind. But responsibility for the. Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash.