Epaned Drug Interactions: What to Avoid and What to Tell Your Doctor

Epaned (enalapril maleate oral solution) is an ACE inhibitor with several important drug, supplement, and food interactions that patients should know about. Some of these interactions reduce Epaned's effectiveness; others can cause serious side effects. Here's what you and your prescriber need to know.

Major Interactions: Avoid or Use with Extreme Caution

Aliskiren (Tekturna) in diabetic patients: Combining Epaned with aliskiren (a direct renin inhibitor) in patients with diabetes significantly increases the risk of low blood pressure (hypotension), dangerously high potassium levels (hyperkalemia), and kidney failure. This combination is contraindicated in diabetic patients. Even in non-diabetic patients, dual blockade of the RAAS system should generally be avoided.

Other ACE inhibitors or ARBs (angiotensin receptor blockers): Taking Epaned together with another ACE inhibitor or an ARB like losartan or valsartan is generally avoided. Dual RAAS blockade increases the risk of hypotension, hyperkalemia, and acute kidney injury compared to using just one agent. If you're on an ARB, don't also take Epaned without explicit guidance from your doctor.

Moderate Interactions: Use with Caution and Monitoring

NSAIDs (ibuprofen, naproxen, celecoxib, etc.): Nonsteroidal anti-inflammatory drugs can reduce the blood pressure-lowering effect of Epaned. They can also increase the risk of kidney impairment when combined with ACE inhibitors, especially in older adults, those with existing kidney disease, or patients who are dehydrated. If you need pain relief, talk to your doctor — acetaminophen (Tylenol) is generally preferred.

Potassium-sparing diuretics (spironolactone, amiloride, triamterene): Both Epaned and potassium-sparing diuretics raise potassium levels in the blood. Combining them increases the risk of hyperkalemia (dangerously high potassium), which can cause life-threatening heart rhythm problems. Your doctor should monitor your potassium levels regularly if you're on both.

Potassium supplements and potassium-containing salt substitutes: For the same reason as potassium-sparing diuretics, taking potassium supplements or using salt substitutes that contain potassium chloride (like No Salt or Nu-Salt) while on Epaned increases hyperkalemia risk.

Diuretics (loop and thiazide, e.g., furosemide, hydrochlorothiazide): Patients already on diuretics who start Epaned may experience a significant drop in blood pressure (symptomatic hypotension), especially after the first dose. Your doctor may reduce the diuretic dose, have you hold a dose, or start Epaned at a lower dose to minimize this risk.

Lithium: ACE inhibitors including enalapril can increase lithium levels in the blood by reducing the kidneys' ability to excrete it. If you take lithium for bipolar disorder or another condition, your doctor should monitor lithium levels carefully when starting Epaned.

Other Notable Interactions

Injectable gold (sodium aurothiomalate): Rarely, patients receiving injectable gold therapy (used for rheumatoid arthritis) who also take enalapril have experienced a reaction called a nitritoid reaction — characterized by flushing, nausea, dizziness, and low blood pressure. This combination is not contraindicated but the reaction should be discussed with your doctor.

mTOR inhibitors (temsirolimus, everolimus, sirolimus): Combining mTOR inhibitors (used in cancer and transplant medicine) with ACE inhibitors may increase the risk of angioedema. Report any facial swelling, lip swelling, or throat tightness immediately.

Sacubitril/valsartan (Entresto): Do not take Epaned within 36 hours of sacubitril/valsartan (Entresto). Combining them significantly increases the risk of angioedema. If transitioning from Epaned to Entresto, a 36-hour washout period is required.

Supplements and Natural Products

Potassium supplements and high-potassium herbal products: As noted above, these raise hyperkalemia risk when combined with Epaned.

St. John's Wort: Some evidence suggests St. John's Wort may reduce blood levels of some cardiovascular medications, though data on enalapril specifically are limited. Inform your prescriber if you take any herbal supplements.

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What to Tell Your Doctor and Pharmacist

Before starting Epaned, give your prescriber and pharmacist a complete list of:

All prescription medications (including diuretics, other blood pressure drugs, diabetes medications)

All over-the-counter medications (especially NSAIDs like ibuprofen or naproxen)

All vitamins, minerals, and dietary supplements (especially potassium)

Any herbal or natural products

Any history of angioedema — with or without ACE inhibitor use

For a full rundown of Epaned's side effects — including the serious ones to watch for — read our companion guide: Epaned side effects: what to expect and when to call your doctor.