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This is what my wife gives me when I get sick in Colombia. Both available without a prescription and inexpensive.

Metronidazol (generic name) is an antibiotic effective against anaerobic bacteria and certain parasites. It is effective for dracunculiasis, giardiasis, trichomoniasis, and amebiasis.

Albendazol (generic) is a medication used for the treatment of a variety of parasitic worm infestations. It is useful for giardiasis, trichuriasis, filariasis, neurocysticercosis, hydatid disease, pinworm disease, and ascariasis, among others. It is taken by mouth

May I suggest a different route on your return to Medellin? I would go by way of Pasto, Popayan, Cali (or Palmira), Tulua. Then you can continue north (and more direct) to Medellin -OR- if you're in no rush to get back to Medellin, divert slightly east to Armenia, el Eje Cafetero (the coffee region), Nevado del Ruiz (a beautiful snow capped volcano... dormant), Manizales, Medellin.

Will you be in Medellin in August?