Commonly used amoxicillin dosage forms include capsules, granules, and tablets, etc. The daily dosage is related to age, body weight, and the severity of the disease, for example, in adults, it is usually 0.25-0.5 grams each time, three to four times a day. For children, the dosage should be calculated strictly according to their body weight. 1. The influence of age and body weight on the dosage of the drug: the general dosage for adults is 0.25-0.5g every 6-8 hours, and the total daily dose should not be more than 4g. The dosage for children can be calculated according to their body weight, 20-40mg/kg/day, divided into 3-4 times. 2. The effect of the disease itself on the dosage: for patients with severe infections, the dosage of amoxicillin can be increased appropriately; for people with severe renal impairment, the dosage needs to be reduced appropriately. Amoxicillin adverse reactions mainly include nausea, vomiting diarrhea and other gastrointestinal reactions, but also may appear rash, fever and thrombocytopenia and other side effects. It needs to be contraindicated for those who are allergic to penicillin or have a positive skin test. Amoxicillin is a semi-synthetic penicillin, can inhibit the synthesis of bacterial cell walls and play a bactericidal effect, the drug’s antibacterial spectrum is broader, can be used for a variety of bacterial infections, in the use of strict compliance with the doctor’s instructions before use.