The recommended dose of VIAGRA and terms of use may cause some unwanted effects. These effects are usually mild or moderate degree. The most common undesirable effects are headache and hot flushes per cent. Least undesirable effects reported indigestion, dizziness, nasal congestion and tran.nt visual effects are related to (mixing colors, glare or blurred vision). VIAGRA more than once a day if taken muscle pain may occur. Rarely, after taking VIAGRA long-term and sometimes painful erections have been reported. An erection lasts for more than four hours, please contact the doctor immediately. If you have any unwanted effects and inconvenience, the impact is severe or persists despite discontinuation of the treatment status inform your doctor. Not included in this brochure VIAGRA'nın unwanted effect tell your doctor or pharmacist if you have noticed