Amoxicillin
Amoxicillin is an antibiotic of the penicillin family. It prevents susceptible bacteria from building their cell wall, so they cannot divide and are destroyed. It is prescribed for bacterial infections and does nothing against viral illness.
It works with food or without, so meals can be arranged for comfort. The course is finished as prescribed even after the symptoms settle, because stopping early leaves the hardier bacteria behind. Like other broad antibiotics it disturbs the gut flora, which is why loose stools are common during a course and why probiotics are spaced a few hours away from it rather than swallowed together. Alongside warfarin the blood-thinning effect can strengthen, so clotting is watched more closely. A known penicillin allergy rules this drug out entirely, and that history is worth stating before any prescription.
Rash, hives, swelling of the face, lips or throat, or difficulty breathing suggest an allergic reaction and need urgent medical attention. Watery or bloody diarrhoea that persists or appears after the course has ended, or a fever that fails to improve, also means see a doctor.
Reference information, not medical advice. Discuss any change with your doctor.