How long does it take to feel effects of Claritin?

Claritin (loratadine) typically starts to take effect within 1 to 3 hours after ingestion. Its peak effectiveness is usually reached around 8 to 12 hours after taking the medication. For most people, relief from allergy symptoms can last up to 24 hours, which is why it is often taken once daily. Individual responses may vary, so some may feel effects sooner or later.