From my personal experience, pharmacies in many areas of Bangkok have a very limited selection of products.

I tried these 2 in Sukhumvit, both had excellent prices and a very good selection.

http://www.thaivisa.com/forum/topic/366218-good-pharmacy-in-bangkok/

I have found the SC Pharmacy on Rama IV between Silom and Suriwong to have very good prices. They have had every drug I wanted to buy.

great one, huge selection, on On Nut, turn right into Soi On Nut when you get there coming from the BTS On Nut station, it's down just about a half block on the right. Have gone there for years, only seen one other Westerner. Best prices, I believe, that you can get anywhere.

I always go to Boots,reliable and i can be sure that i will always have the pharmacist to help me with.

Yes, that South East Pharmacy is pretty incredible. Service, selection, location and pricing are all phenomenal. Thanks for the tip.

I always go to Boots,reliable and i can be sure that i will always have the pharmacist to help me with.

I think if you compare the prices at Boots with the SC, for example, you will find you are paying way more than you have to.