The reason why is because of their effect on the brain.

Here’s what it’s crucial that you know.

Which Antihistamines May Lead to Weight Gain?

antihistamines and a scale

Photo Illustration by Zack Angeline for Verywell Health; Getty Images

Experts say they are less likely to contribute to weight gain, too.

But they emphasize that short-term use of antihistamines is generally not problematic.

If long-term use is necessary, you should speak with a healthcare provider about potential side effects and risks.

2018;4(1):e000392.