For Viagra to be effective, sexual stimulation is required. The U. Pharmacies offer two categories of drugs: prescription medications that are prescribed by a doctor and are reimbursed by the French social security system and over-the-counter drugs more common among travelers. It works by blocking the phosphodiesterase enzyme, which normally breaks down a substance known as cyclic guanosine monophosphate cGMP. The dose may be increased to a maximum of mg or decreased to 25 mg depending on the effectiveness and side effects. Most useful in case of particularly painful menstrual cramps or stomach ache. In the questionnaire, scores for the question on how often the patient was able to achieve intercourse went from about 2 without treatment to 3 or 4 with Viagra 50 mg.I think you are not going to find it easy to buy your prescription drugs over here, and certainly not as cheaply as in the US. Having lived in France for over 20 years, it is . # 1 kenav Original Poster Join Date: Oct Posts: 3, Likes: 0 Received 0 Likes on 0 Posts What OTC drugs can you buy in France that you need an Rx for in U.S.? I seem . 1. Re: Viagra 18 years ago Save I’m not aware of the need of Rx to bring with you any medication, obviously if you are bringing the amount necessary for the course of .