In pulmonary hypertension it works by relaxing blood vessels in the chest. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. Common ones include: Flushing of the skin. What should I do if I forget a dose? Do not take a double dose to make up for a missed one. · For information on the dosage of Viagra, including its pill form, strengths, and how to take the drug, keep reading. Do not take more than one dose of Viagra per day. Doing this can increase. 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. Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection. You should take sildenafil about an hour before planned sexual activity, so it has time to work.

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