Hello. New rules have taken effect here in TJ as well as all of Mexico. It is now required to have a prescription for anti-biotics and the like. It use to be that this was not required BUT now is. NO PROBLEM. They also put in place a system to overcome this. Most pharmacies WILL HAVE someone to issue this document ON SITE. Since you are walking across the border, there are MANY pharmacies there. You DO NOT need to take a cab. After you cross into TJ, take the first right that will take you to the MCDONALD's (dont go straight to the yellow cabs) Take a right 100 feet before the yellow cabs. There are at least 10 pharmacies within 100 feet of the Mcdonald's. Suggest you take your USA prescription with to help in both aquisition and return to US. You will also need your passport or equivalent to return to US.
*Pharmacies are plentiful in Tijuana
*You can get Viagra, Cialis, muscle relaxants and even pain killers
*Some places won't even ask for a doctors note
*I recommend for pain killers, you bring an empty bottle or photocopy of an old prescription which makes the process nice and easy the first time around. Eventually you'll figure out which stores you enjoy going to and dealing with.
*Pain killers can cost a bit more than in the USA for Perks and Vikes, but it may be worth your while if you don't have a doctor back home who can fullfill a prescription
*Generics are also available
*Some of the generics are made in Mexico while others are from India and South America
*I've never had any friends have issues with their pills, although the dosages sometimes are a bit weaker than the non generics
There are hundreds of drugstores in Tijuana which sell medicines mainly to... U.S. citizens. They are allowed to import legal drugs (registered in US market) but only for personal use and exclusively if prescribed by U.S. doctors. So if you are U.S. citizen take your prescription in case the U.S. customs asks.
What to buy: Medicines.
What to pay: Much less than in the USA.
Plenty of Pharmacies are along the streets of the tourist areas. There are several drugs you can buy here, that you would need a prescription for in the USA.