Does Antihistamine Work For An Itchy Scalp?

TL;DR

Antihistamines can reduce itching from head lice by blocking the allergic response to louse bites. They don't kill lice — you still need to treat with silicone- or oil-based products or wet combing.

Antihistamines and lice itching

Itching from lice is caused by an allergic reaction to louse saliva. Oral antihistamines (e.g. cetirizine) can help relieve the itch while you treat. They're useful for children who scratch a lot.

Don't rely on antihistamines alone

Antihistamines only ease symptoms. You must still remove or kill lice. Use a silicone- or oil-based product or wet combing. Repeat after 7–10 days. Not sure? Check first. For hands-on help, find a clinic near you.