Most will prescribe the 50mg tablet at first to patients who are just starting to take Viagra. Topicals tend to have a lower risk of side effects compared to oral medications, Dr. Pearlman says. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. Typically this takes the form of a tick box medical questionnaire, which is then reviewed by the pharmacist prior to supply. If you fall into these categories, consult with a urologist in person about alternative treatments such as MUSE urethral suppositories or penile injection therapy.14th July Manual Health Centre See your GP for a prescription. A prescription from your GP may allow you to get Viagra (or unbranded Sildenafil) for a lower cost than over . Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles .