It's an antihistamine. It's also used by humans for allergies.
It's very cheap to buy at the pharmacy.
https://www.amazon.com/Major-Pharmaceuticals-Chlorpheniramine-Maleate-Anti-Allergy/dp/B005TM1YIG/ref=sr_1_3?crid=2VJ0HX7ZQN2DE&keywords=chlorpheniramine+maleate+4mg&qid=1555990097&s=gateway&sprefix=chlorphenira%2Caps%2C188&sr=8-3
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