(Virbac) Ammonil Tablets are a urinary acidifier for use in dogs and cats. The suggested dosage of Ammonil Tablets for adult cats is 200 mg per 10 lbs body weight 3 or 4 times daily with food. The suggested dosage of Ammonil Tablets for dogs is 200 mg per 10 lbs. body weight once or twice daily with food. DL-Methionine.