Written and reviewed by Emily W., PhD · Last reviewed: November 3, 2025
Blood pressure medication is one of the most commonly prescribed drug classes in the US, and several routine over-the-counter products interfere with it. Most people are never told this, and the interactions are easy to miss because the offending products sit on open shelves.
This is general information. Your specific medication list matters, so use it as a prompt to ask your pharmacist rather than as a substitute for doing so.
1. NSAIDs — the most common problem
Ibuprofen (Advil, Motrin), naproxen (Aleve), and other anti-inflammatories can raise blood pressure and reduce the effectiveness of most blood pressure medications. They cause the body to retain sodium and fluid, and they reduce blood flow to the kidneys.
The interaction is strongest with ACE inhibitors (names ending in -pril), ARBs (ending in -sartan), and diuretics. The combination of an ACE inhibitor or ARB, a diuretic, and an NSAID is sometimes called the “triple whammy” because of its effect on kidney function.
What to use instead: acetaminophen for pain and fever. It does not carry the same effect. See acetaminophen versus ibuprofen.
Occasional NSAID use for a day or two is different from daily use. Discuss regular use with your doctor rather than stopping anything on your own.
2. Decongestants
Pseudoephedrine (Sudafed) and phenylephrine narrow blood vessels, which is how they clear a blocked nose — and also how they raise blood pressure. Decongestant nasal sprays have less systemic effect than tablets but are not risk-free.
What to use instead: saline nasal rinse, a steroid nasal spray, or an antihistamine if the cause is allergic. Many cold and flu combination products contain decongestants, so check the label carefully — see Mucinex and Sudafed.
3. Certain cold and flu combination products
These often bundle a decongestant with other ingredients. Look specifically for pseudoephedrine or phenylephrine on the Active Ingredients panel. Products labelled for “sinus” or “congestion” almost always contain one.
4. Some antacids and supplements
Antacids containing sodium can contribute to fluid retention. Calcium supplements can interfere with the absorption of some blood pressure medications if taken at the same time — spacing them by two hours usually resolves this.
Potassium supplements and salt substitutes containing potassium chloride need caution with ACE inhibitors, ARBs, and potassium-sparing diuretics, all of which already raise potassium levels.
5. Grapefruit — with specific medications only
Grapefruit and grapefruit juice interfere with the enzyme that breaks down certain calcium channel blockers, particularly felodipine and nifedipine, leading to higher drug levels than intended. It does not affect all blood pressure medications. Check whether yours is on the list.
6. Herbal products
Several are worth flagging: licorice root can raise blood pressure and lower potassium; St John’s wort affects the metabolism of many drugs; ephedra and bitter orange are stimulants. Ginseng and yohimbe have also been associated with blood pressure changes.
Tell your doctor about supplements. Most people do not, because they are not thought of as medication.
7. Caffeine in high doses
Normal coffee intake is generally fine for most people. High-dose caffeine in energy drinks and pre-workout supplements can cause meaningful short-term blood pressure rises.
Quick reference
| Avoid or check | Use instead |
|---|---|
| Ibuprofen, naproxen | Acetaminophen |
| Pseudoephedrine, phenylephrine | Saline rinse, steroid nasal spray |
| Potassium salt substitutes | Herbs and spices for flavour |
| Licorice supplements | Discuss alternatives |
| Grapefruit (with some CCBs) | Other citrus |
The practical step
Keep a current list of everything you take — prescriptions, over-the-counter products, and supplements — on your phone. Show it to the pharmacist before buying anything new. It takes a minute and catches nearly all of these.
Also relevant if you are unwell: illness itself affects blood pressure and hydration. See signs of dehydration in adults.
Related reading
- Acetaminophen vs Ibuprofen for Fever: Which Works Better?
- Can You Take Mucinex and Sudafed Together?
- Signs of Dehydration in Adults: When You Need Medical Help
Sources
- Drug Information — MedlinePlus, U.S. National Library of Medicine
- Drug Therapy — MedlinePlus
- U.S. Food and Drug Administration
Medical disclaimer: This article is for general information only and is not a substitute for advice from a qualified healthcare professional. It should not be used to diagnose or treat a health problem. Always speak to your doctor or pharmacist about your own situation. If you think you may have a medical emergency, call 911 or go to your nearest emergency department.
