Any hospital or clinic. Cost anywhere ftom 200 to 1000 baht depending on hospital and doctor. Make clear you want a written script to gill outside amd not meds from the hospital pharmacy.

Thanks Sheryl,

Do you have any suggestions in Bangkok? Cheap, and not taking too much time/hassle to get the prescription?

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Most pharmacies carry Sidegra, the Thai generic equivalent of Viagra. As to where to get a script, literally any hospital or clinic - I have not heard of anyone haviong a problem with this. For those in the Silom area, both Bangkok Christian Hosp and St Louis are inexpensive for consultations and the Boots on Silom have Sidegra right behind the counter with a "prescription only" notice.