The main advice was the same in every article I could get my hands on: be careful not to go to a cheap clinic — they will sometimes use a Botox substitute without telling you. It's not as effective and can sometimes be dangerous. Instead, stick to the clinics in big cities like Bangkok or Patong Beach in Phuket. The large shopping malls (Siam Paragon Mall, Emporium Mall, and Discovery Center) all have clinics or spas where you can get safe and effective Botox injections. Most of these mall clinics even take walk-ins.
One of the best "mall clinic chains" in Thailand had multiple locations in all the major cities. I found one in the main Phuket shopping mall, which also happened to be walking distance from our hotel. Perfect.
