Typically this takes the form of a tick box medical questionnaire, which is then reviewed by the pharmacist prior to supply. The products discussed in this site may have different product labeling in different countries. You are encouraged to report adverse events related to Viatris products by calling U. 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. They both contain the active ingredient Sildenafil, which is also available as a generic unbranded tablet.Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. VIAGRA may affect the . Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung . Is there an over-the-counter version of Viagra? Can I get Viagra online without seeing a doctor? Currently, there are no over the counter alternatives to Viagra available.