What are the rules for bringing a three-month supply of non-narcotic prescription medication to Thailand?

When planning to bring a three-month supply of non-narcotic prescription medication into Thailand, it's generally advised to carry a letter from your doctor confirming the prescriptions. While many expats report having successfully brought in their medications without issue, it's important to ensure that the medications are in their original labeled containers. Some users suggest that a legitimate medical need for the medication typically mitigates concerns regarding quantity. It's also noted that many medications are available over-the-counter in Thailand, making it worthwhile to check local pharmacy prices before traveling.