Not sure if anyone is aware of this. I'm copying this from my daily blog: We got off the metro at Poblado station and took a taxi to the Guayabal neighborhood. The business is called Tecnoquímicas and is at Carrera 51 #14-249.
Inside their office we gave the receptionist 8 empty boxes of my Isoklon sleeping pill medicine with their purchase receipts. She asked the name of my doctor who prescribed them but I couldn’t remember it (even though I had it in my cell phone). After about a 5 minute wait a lady came out and gave us 8 new refilled boxes. What a deal! So we saved 63,900 pesos * 8 = 511,200 or about $160. I'm not sure what medications are covered, I just know this worked for me.