Amoxil (amoxicillin) is a prescription penicillin-like antibiotic specially designed for people suffering from the symptoms of skin infections, pneumonia, H. pylori, bronchitis, chlamydia infections, infections of the ears, nose, or throat, gonorrhea, and some urinary tract infections. Your doctor will need to know if you have any of the following medical conditions before actually prescribing Amoxil: liver disease, a history of diarrhea caused by antibiotics, kidney disease, blood clotting disorder, mononucleosis, or asthma. Those medical conditions may affect the success of your treatment if the dose is not properly adjusted and based on your individual needs. Never take Amoxil if you have a history of an allergic reaction to dicloxacillin, ampicillin, oxacillin, or penicillin, as the same reaction is going to happen again. Tell your doctor about any serious side effects you get - such as unusual bleeding or bruising, seizures, excessive tiredness, severe skin rash, yellowing of the skin or eyes, pale skin, or hives. Less serious side effects include vaginal itching, headache, nausea, swollen tongue, vomiting, upset stomach, and diarrhea.