Drowsy hayfever and allergy tablets, that also can be used for insomnia, travel sickness and more. __Benefits:__ - Phenergan tablets, for hayfever and allergy relief - Each tablet contains 10mg of promethazine hydrochloride - Drowsy antihistamine tablets: can also be used to treat insomnia in adults - Also help to treat or prevent nausea, such as in travel sickness - Can be used for both children and adults, in different doses - Do not take for more than seven days at a time Phenergan Tablets, which contain the active ingredient promethazine hydrochloride 10mg, are used to treat hayfever and other allergic conditions such as nettle rash and hives. They can also be used to treat insomnia in adults and to treat/prevent nausea and vomiting such as travel sickness. Using the active ingredient promethazine 10mg, Phenergan tablets work by blocking histamine, the natural substance that your body makes during an allergic reaction. Promethazine also works directly on the brain to help you feel more relaxed. To learn more about allergy treatment, check out [our guide to hay fever and allergies](https://www.medino.com/article/what-is-hayfever-pharmacist-guide).