Where can I buy American brand children’s medicine in Thailand, especially in Chiang Mai, Chiang Rai, or Bangkok?

The user is seeking information on where to purchase American brand children's medicine in Thailand, specifically in the areas of Chiang Mai, Chiang Rai, or Bangkok, and is interested in shipping options. Comments indicate that while American brands may not be commonly found, similar products might be available at local pharmacies or through online platforms like Lazada. There's also a question about the preference for American brands over Thai ones.