How quickly does Piriton work?. Piriton usually starts to work within 30 minutes to an hour. Can I drink alcohol while taking Piriton?. 1x30 Piriton Allergy & Hay Fever 4mg Tablets. Piriton 4mg Tablets provide effective relief from allergy symptoms such as hay fever, pet allergies, dust mite allergies, and skin rashes.
