If you will travel in mexico, and you need to buy some medicines, pharmacies in Mexico are actually open 24 hours. Some are closed around 10 pm but other are open until midnight. In smaller towns, pharmacies usually take turns in staying open all night.

Although you can buy most medicines over the country in Mexico, however, buy only the medicines that you know are safe for your health. If you need some painkiller for a headache or remedy for your antiacids, just make sure you buy the medicine that you have taken before in your own self prescription perspective. However, if you need some medicine that is more than the usual ailments, it is always best to see a local doctor to get a prescription.