Yes, you can take Claritin while breastfeeding. The American Academy of Pediatrics classifies loratadine (Claritin’s generic drug name) as usually compatible with breastfeeding. Additionally, studies show¹  that Claritin has low milk transfer levels, which means only a small amount of the drug is likely to reach the infant through breast milk. 

However, it's important to use any medication as directed and in moderation. Although Claritin is considered generally safe, there’s a chance it could decrease your milk production. It's always a good practice to consult with a healthcare provider or a lactation consultant before starting any new medication while breastfeeding.