Can you take Claritin and vitamin B12 together?
Yes, it is safe to take Claritin (loratadine) and vitamin B12 together. No known drug interactions exist between them, as loratadine—a non-sedating antihistamine—does not affect B12 absorption or metabolism, and B12 supplements do not interfere with loratadine's action on histamine receptors.[1][2]
What do drug interaction checkers say?
Major databases like Drugs.com, WebMD, and RxList report no interactions. For example, Drugs.com's checker lists zero issues for loratadine + cyanocobalamin (common B12 form).[1][3] This holds for standard oral doses: 10 mg Claritin daily and typical B12 (e.g., 1,000 mcg).
Any risks or side effects to watch for?
Neither causes additive side effects. Claritin may rarely cause headache or dry mouth; B12 is well-tolerated with minimal risks like mild diarrhea at high doses (>2,000 mcg). No evidence of combined issues in clinical data or case reports.[2][4] People with B12 deficiency (e.g., vegans, elderly) or allergies should confirm with a doctor, but the combo itself poses no concern.
Who might need to be cautious?
Those on multiple meds (e.g., metformin, which lowers B12) or with kidney issues—consult a pharmacist. No age-specific warnings; safe for adults, kids (Claritin-approved ages), and pregnancy (both Category B).[3][5]
[1]: Drugs.com - Loratadine and Vitamin B12 Interactions
[2]: WebMD - Loratadine Interactions
[3]: RxList - Claritin Drug Interactions
[4]: NIH Office of Dietary Supplements - Vitamin B12
[5]: FDA - Claritin Label