If you are talking about a pharmacy ... all you have to do is walk across - there are like 6 within a 5 minutes walk.

Here is a key detail ..... walk through to Mexcio. Walk past the Mexican guard station. Then the walkway spilts. Go straight and you walk into the taxci area. Hang a righgt - and a little longer walk on that walkway - and you walk right onto an era of Revolucion with like 4 Pharmacies RIGHT in from of you. And even if you hang left imdeiately from there and walk back to the US, you will walk by 2 more.