Amoxicillin dosage for chest infectionfollicles of the face, chest . how to treat sinusitis amoxicillin dosage for children 3. breathing; tightness in the chest . . . . . . . . Best Answer: You should see your doctor!!! Amoxicillin can cause heart burn, as with all antibiotics. . . . . Most sinus . . . Common infections that amoxicillin is used for include . . Long-term or repeated use of Amoxicillin may cause a second infection. what does amoxicillin treat 5. Sinus infection: Dosage & dur... more