Sildenafil as Viagra or Revatio can only be obtained with a doctor’s prescription. Even generic sildenafil requires a doctor’s prescription, at least in the United States (for now).
Options for Over the Counter Viagra
Viagra can be purchased over the counter in the United Kingdom. This decision to make a version of the drug available as an OTC medication was made by the UK’s Medicines and Healthcare Products Regulatory Agency as a way to cut down on the high number of counterfeit Viagra pills being sold and distributed.