The assumption, based on your history, is that the infection is caused by bacteria and that you have found an OTC antibiotic in the past (in Peru).
If you remember the name (brand) of the antibiotic, that would be helpful. The statement in parentheses is where you'd insert the brand name of the medicine you had in Peru.
Tengo una infección de la vejiga y me gustaría comprar un antibiótico para quitármela sin receta, si es posible.
(En Perú, sufría de la misma infección y me vendieron _______.)
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