Sildenafil may cause side effects. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. You can take it in a small dose daily or in a larger dose as needed. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. However, all medications come with risks. Privacy: Confirm that your personal data and payment details are confidential. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash.Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial . Cost Pregnancy Birth control needs Breastfeeding For professionals Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile . You can only get VIAGRA by prescription from your doctor or healthcare provider. HOW TO GET BRAND-NAME VIAGRA top. Pay for your VIAGRA prescription and mail .