Not routinely. Benadryl and Claritin are both antihistamines, so combining them stacks side effects without stacking benefits.
Diphenhydramine (Benadryl) is short-acting and strongly sedating; loratadine (Claritin) is a once-daily, low-sedation antihistamine. Taking both means more drowsiness, dizziness, and dry mouth, and in older adults a higher risk of confusion and falls. MedlinePlus warns about these effects for each drug on its own, and doubling the class makes them more likely. The exception is directed care: for severe hives or a significant allergic reaction, a clinician may intentionally layer a fast-acting antihistamine over your daily one. Seek emergency care for swelling of the face or throat, wheezing, or faintness; those are not wait-and-see symptoms.
What to do
Common questions
Can I take Benadryl with Claritin?
As a routine, no. Benadryl (diphenhydramine) and Claritin (loratadine) are both antihistamines, so taking them together doubles up on the same drug class. That raises the risk of side effects like heavy drowsiness, dizziness, dry mouth, and confusion, especially in older adults, without giving you better allergy control. If your once-daily Claritin is not cutting it, the fix is usually not stacking a second antihistamine; it is adding a different kind of treatment, like a nasal steroid spray or eye drops, or reviewing triggers. There is one real exception: for a severe allergic reaction or bad hives, doctors sometimes deliberately add a fast-acting sedating antihistamine on top of a daily one. That is a directed medical decision, not a self-care move. If you took both by accident, do not panic: skip driving, expect to be drowsy, and seek care for trouble breathing, confusion, or a racing heart.