Can you take Benadryl and naproxen (Aleve) together?
The two molecules don't interact — but the answer depends on which box you are holding: Aleve PM is already this exact combination in one caplet, and Benadryl Allergy Plus Congestion adds a decongestant that pushes blood pressure the same way the NSAID does.
Why
The two drugs do different jobs and don't collide. Aleve's Drug Facts list one active ingredient — "Naproxen sodium 220 mg (naproxen 200 mg) (NSAID)", purpose "Pain reliever/fever reducer" — and MedlinePlus says it "works by stopping the body's production of a substance that causes pain, fever, and inflammation," which is also why the Aleve label tells you to ask a doctor before use if "you have high blood pressure, heart disease, liver cirrhosis, or kidney disease." Benadryl's Drug Facts list "Diphenhydramine HCl 25 mg", purpose "Antihistamine"; MedlinePlus says it "works by blocking the action of histamine, a substance in the body that causes allergic symptoms," and because it crosses into the brain it also sedates. Neither label names the other drug anywhere in its "Do not use," "Ask a doctor before use if" or "Ask a doctor or pharmacist before use if you are" sections. What actually gets people hurt in this genre is duplicate active ingredient. Aleve PM's Drug Facts list TWO actives per caplet — "Naproxen sodium 220 mg (naproxen 200 mg) (NSAID)" as "Pain reliever" and "Diphenhydramine hydrochloride 25 mg" as "Nighttime sleep-aid". Aleve PM *is* this combination in a single pill, so taking a Benadryl on top of Aleve PM is a double dose of diphenhydramine, and taking a plain Aleve on top of Aleve PM is a double dose of naproxen. Both labels say it outright under Do not use: "with any other product containing diphenhydramine, even one used on skin" — which sweeps in anti-itch creams, gels and sprays, not just pills. Any pain reliever sold in a "PM" or nighttime version deserves the same look at its active ingredients before you add anything. Second, "Benadryl" is not one product. Benadryl Allergy Plus Congestion lists "Diphenhydramine HCl 25 mg" / "Antihistamine" PLUS "Phenylephrine HCl 10 mg" / "Nasal decongestant". That decongestant is a poor partner for an NSAID: its own label says to ask a doctor before use if you have "heart disease" or "high blood pressure" — the same two conditions Aleve's label flags — and it carries an absolute contraindication that plain Benadryl does not, do not use "if you are now taking a prescription monoamine oxidase inhibitor (MAOI) (certain drugs for depression, psychiatric or emotional conditions, or Parkinson's disease), or for 2 weeks after stopping the MAOI drug." Sedation is additive with anything else that sedates, and the labels differ in strictness: plain Benadryl says "marked drowsiness may occur," "avoid alcoholic drinks," "alcohol, sedatives, and tranquilizers may increase drowsiness" and "be careful when driving a motor vehicle or operating machinery," while Aleve PM, at its 2-caplet bedtime dose (50 mg of diphenhydramine), says "drowsiness will occur" and flatly "do not drive a motor vehicle or operate machinery."
What to watch for
Read the actual box and count active ingredients, not brand names — and look for the word "diphenhydramine" itself rather than a particular salt name, because nighttime combination products don't all use the same one. If a package lists diphenhydramine, do not add Benadryl; if it lists naproxen, ibuprofen or "NSAID", do not add Aleve. CEILINGS ARE PER PRODUCT — never carry one product's allowance over to another. Aleve (its Drug Facts count in caplets; the carton also calls them tablets, same 220 mg unit): "take 1 caplet every 8 to 12 hours while symptoms last," "for the first dose you may take 2 caplets within the first hour," "do not exceed 2 caplets in any 8- to 12-hour period," "do not exceed 3 caplets in a 24-hour period." Aleve PM: "adults and children 12 years and over: take 2 caplets at bedtime," "do not take more than 2 caplets in 24 hours" — if you take Aleve PM, that is your naproxen for the day; its label does not authorise topping up with plain Aleve, and taking "other drugs containing prescription or nonprescription NSAIDs (aspirin, ibuprofen, naproxen, or others)" is itself on the label's list of things that raise your bleeding risk. Benadryl tablets: adults and children 12 years and over "1 to 2 tablets," "take every 4 to 6 hours, or as directed by a doctor," "do not take more than 6 times in 24 hours." Benadryl Allergy Plus Congestion has its own, tighter cap: "take 1 tablet every 4 hours," "do not take more than 6 tablets in 24 hours." Time limits (Aleve): stop and ask a doctor if "pain gets worse or lasts more than 10 days" or "fever gets worse or lasts more than 3 days." Stop and get help for signs of stomach bleeding — the Aleve label lists "feel faint," "vomit blood," "have bloody or black stools," "have stomach pain that does not get better" — or for heart symptoms, which the Aleve PM label lists as "chest pain," "trouble breathing," "weakness in one part or side of body," "slurred speech," "leg swelling." The NSAID risk is real and dose-related: "NSAIDs, except aspirin, increase the risk of heart attack, heart failure, and stroke. These can be fatal. The risk is higher if you use more than directed or for longer than directed" (Aleve PM label). Alcohol is a double hit here, and the page you are on is the only place you may see both halves: extra drowsiness from the diphenhydramine, and extra stomach-bleeding risk from the naproxen. The Aleve label's own stomach-bleeding list is: "are age 60 or older," "have had stomach ulcers or bleeding problems," "take a blood thinning (anticoagulant) or steroid drug," "take other drugs containing prescription or nonprescription NSAIDs (aspirin, ibuprofen, naproxen, or others)," "have 3 or more alcoholic drinks every day while using this product," "take more or for a longer time than directed." Ask a pharmacist BEFORE combining if any of those apply, or if you have high blood pressure, heart disease, liver cirrhosis, kidney disease, a history of stomach problems, asthma, or take a diuretic (Aleve's ask-a-doctor list), or if you have glaucoma, trouble urinating due to an enlarged prostate gland, or a breathing problem such as emphysema or chronic bronchitis (Benadryl's list). Pregnancy: the two naproxen labels print different thresholds. Plain Aleve still says "It is especially important not to use naproxen sodium during the last 3 months of pregnancy unless definitely directed to do so by a doctor"; Aleve PM says "It is especially important not to use naproxen sodium 20 weeks or later in pregnancy unless definitely directed to do so by a doctor." Same molecule, two label vintages — go by the earlier limit and ask your doctor before taking any naproxen in the second half of pregnancy. Children: Aleve's directions say for "Children under 12 years" — "ask a doctor," and Aleve PM's Do not use says "in children under 12 years of age." Benadryl tablets are dosed on-label lower: "children 6 to under 12 years 1 tablet," and "children under 6 years do not use." Never give diphenhydramine "to make a child sleepy" — that is the first line of the Benadryl label's Do not use. Adults 65+ should think twice about the Benadryl half specifically: the American Geriatrics Society Health in Aging Foundation (Beers Criteria) tells older adults to "AVOID products that contain the antihistamines diphenhydramine (Benadryl) and chlorpheniramine (AllerChlor, Chlor-Trimeton)" because "They can cause confusion, blurred vision, constipation, problems urinating, and dry mouth"; the same list puts NSAIDs under "USE WITH CAUTION" and says "AVOID regular, long-term use of NSAIDs." A non-sedating antihistamine (loratadine, cetirizine, fexofenadine) is usually the better partner for naproxen in anyone over 65, anyone driving, or anyone who has to be sharp.
Sources
- DailyMed – BENADRYL (diphenhydramine hydrochloride 25 mg) tablet, Drug Facts label ↗
- DailyMed – ALEVE (naproxen sodium 220 mg) tablet, Drug Facts label ↗
- DailyMed – ALEVE PM (diphenhydramine hydrochloride 25 mg and naproxen sodium 220 mg) tablet, Drug Facts label ↗
- DailyMed – BENADRYL ALLERGY PLUS CONGESTION (diphenhydramine hydrochloride and phenylephrine hydrochloride) tablet, Drug Facts label ↗
- MedlinePlus (NIH) – Naproxen ↗
- MedlinePlus (NIH) – Diphenhydramine ↗
- American Geriatrics Society Health in Aging Foundation – Ten Medications Older Adults Should Avoid or Use with Caution (Beers Criteria) ↗
This is general reference, not medical advice, and not a guarantee of safety. Interactions depend on your doses, health conditions, and other medicines. Always confirm with your pharmacist or doctor before combining products, and follow the dosing on each label.