I'm posting this info of the crossing I just took as there is almost no info on the internet about it. Take a taxi from the Reynosa airport to downtown for $25US. Or for 8 pesos... From the Reynosa airport, walk 10 minutes to the main road (see Googlemaps). This is a very busy road with half a dozen lanes on each side. However, 30 seconds east of the airport road is a crossing WITH American-style crosswalk. Press the button, wait until the traffic light turns red and cross on your green!
One oral, one IV: Both are actually the same medicine, but Amoxicillin is the oral form of the medication and Ampicillin is the IV form of the medicine. I have actually also seen a few times oral Ampicillin listed as being available, but usually the oral form that is most stable and palatable is the amoxicillin.
Amoxicillin is an antibiotic in a group of drugs called penicillins. Amoxicillin fights bacteria in the body. Clavulanate potassium is a form of clavulanic acid, which is similar to penicillin.