Amoxicillin tablet is usually taken orally, and it can come in the form of capsules, tablets, or a liquid suspension. It is important to take the medication exactly as prescribed by your doctor, completing the full course even if you start to feel better before finishing it. This helps ensure that all the bacteria are killed and reduces the risk of developing antibiotic-resistant bacteria. Common side effects of amoxicillin can include nausea, vomiting, diarrhea, and skin rash. Serious side effects are rare but can include severe allergic reactions, liver problems, and Clostridium difficile-associated diarrhea.