In tijuna there is a pharmacy call hailys. Ask taxi driver to take you there its right off of revolution. about 2 blocks north of hai lie(I know I didnt spell correctly).
They sell everything tylenol 3 valuim xanax halcion oxycotin,soma. I have done business for two years with them and never a problem.Also they take credit cards for part of purchase. I once bought 1500 dollars worth of product and no problem. They speak great english. No scripts needed.