Beaphar Calming Tablets are a herbal supplement for dogs and cats. The tablets contain Melissa officianalis, sometimes called Lemon Balm, which is recognised for its calming properties, along with other beneficial ingredients including rosemary, hop flowers & lime tree blossom. Calming Tablets can help alleviate nervousness, for example, during thunderstorms, firework parties, and other noisy occasions, without causing drowsiness. One packet will treat a large dog for three days at full dose rate or a small dog for fourteen days. Read more… Formerly marketed as "Beaphar Serenity Tablets"Allow 1 ½ hours for tablets to take effect. Tablets can be given directly or added to the food. The treatment can be repeated after 2½ hours; administer no more than 3 times per day. Always keep fresh drinking water available. Cats and small dogs: ½ tabletMedium dogs: 1 tabletLarge dogs: 2 tablets.