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Thank, Yuriko. I just checked Thai website and found that loxonin (lomotil) is now badly restricted in Thailand. A doctor needs to fill many reporting forms to prescribe the drug to a patient. Twenty years ago it was sold freely in any drug store of Thailand :(
Thank you for the follow-up. Yes, there are lots of OTCs in Thailand that are not approved here. I think I saw a news reporting Loxonin has been approved to be sold OTC before, but haven't seen it anywhere yet. There seems to be various adverse effects in Loxonin as you pointed out. Still, many women (including me) believe it is the best drug for menstrual cramp and hope to buy it OTC...
P.S. "Diarrhea" can be more complicated in Britain (they spell it as "diarrhoea", I think :p)
I hit many non-OTC lists and side effects of calona, and loxonin: not recommend for treatment of diarrhea. I am not doctor, though. I remember my Lomotil stomach drug was not allowed into Japan. The same drug with loxonin. sic. I am not happy to write "diarrhea," too complicate spelling? :)