Ampicillin is an antibacterial medication given by injection or by mouth and is used on or off label to treat certain infections. Side effects include allergic reactions or gastrointestinal upset, and neurological signs when given in high doses. Ampicillin use is contraindicated in pets allergic to penicillins and in rabbits, guinea pigs, chinchillas, or hamsters. If a negative reaction occurs, please call your veterinary office.

Amoxicillin-clavulanic acid, also known as amoxicillin and clavulanate potassium (brand name Clavamox®), is a synthetic, penicillin-type antibiotic used to treat infections caused by gram-positive and gram-negative bacteria. It is used to treat skin infections, soft tissue infections, and periodontal disease. Amoxicillin-clavulanic acid comes in tablet and liquid suspension form.

Amoxicillin is given by mouth and is used on and off label to treat certain bacterial infections in a variety of species. Common side effects include gastrointestinal effects such as lack of appetite, vomiting, and diarrhea. Do not use in pets that are allergic to it or other penicillins, cephalosporins, or other beta-lactam antibiotics, or in rabbits, guinea pigs, chinchillas, hamsters, or other small mammals. If a negative reaction occurs, please call your veterinary office.

Ammonium chloride is used off label and given by mouth to treat metabolic alkalosis, struvite stones, and certain toxicities occasionally in small animals and more often in large animals. The most common side effects include pain at the injection site or stomach upset if given by mouth. Do not use in pets with severe liver, kidney, heart, or lung disease. If a negative reaction occurs, please call your veterinary office.

Amlodipine is given by mouth and is used on and off label to treat high blood pressure in cats and dogs. Common side effects include vomiting, diarrhea, lack of appetite, sleepiness, or gingival (gum) overgrowth. Do not use in pets that are allergic to it, are in shock, have aortic stenosis, or are in liver failure. If a negative reaction occurs, please call your veterinary office.