There are no known interactions of antihistaminic drugs such as Claritin and the implant. Neither of the two have been suspected to affect the potency of the other.
I do not think taking claritin makes your your protection any weaker so you will not need to use any additional contraception while you are on claritin.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.