Checked against UN INCB controlled substance lists and Thailand rules.
Thailand controls pseudoephedrine as a precursor chemical. Carrying pseudoephedrine cold medicine is not advised.
Leave it at home. Ask your doctor about an alternative that is legal at your destination, and carry a doctor's letter describing your condition.
Official source for Thailand: www.fda.moph.go.th
Check Sudafed in 21 countriesNot legal or medical advice. Rules change and depend on dose, form and quantity. Always confirm with the Thailand embassy or health authority before you fly. We never tell you a medicine is "safe" to carry.