Meclizine first or second generation?

Is meclizine a first- or second-generation antihistamine?

Meclizine is generally classified as a first-generation (often called “older,” sedating) H1 antihistamine. It works through H1 receptor blockade and is known for causing drowsiness in many people, which fits the first-generation profile.

Why is meclizine considered “first-generation”?

First-generation H1 antihistamines tend to be more sedating because they more readily cross into the brain. Meclizine is used for conditions where motion-sickness and vertigo relief are needed, and its calming/sedating effects are a common part of its clinical profile.

What does this mean for side effects and driving?

Because it’s typically treated as a first-generation antihistamine, meclizine is more likely than newer (second-generation) antihistamines to cause drowsiness, slowed reaction time, and dry mouth—so users are often advised to be careful with driving or operating machinery.