The short answer
Hibiscus tea can lower blood pressure in some people, but a harmful interaction with enalapril or a change in enalapril absorption has not been established. Check regular medicinal use or a concentrated extract with your pharmacist before adding it.
What this answer covers
Oral Hibiscus sabdariffa tea or extracts with oral enalapril. Tea, aqueous calyx extract and other plant parts are not dose-equivalent. Studies of captopril or lisinopril are not direct enalapril interaction evidence.
- Supplement or preparation
- Hibiscus (Hibiscus sabdariffa)
- Medication ingredient
- enalapril
What has been seen with hibiscus tea?
A six-week trial in 65 adults used three 240-mL servings of brewed hibiscus tea daily. Systolic pressure fell more than with placebo, while the diastolic difference was not significant. Participants were not taking blood-pressure medicines, so this does not show what happens when enalapril is added.
Does hibiscus change enalapril absorption?
The relevant drug-level experiment checked was in rats given captopril after an aqueous hibiscus calyx extract. Captopril exposure decreased. Captopril and enalapril are different medicines, and animal doses are not human doses. That experiment cannot establish an enalapril absorption interaction or justify an avoidance rule for this pair.
Does a tea result cover a concentrated extract?
No. The concentration, plant part, preparation and amount matter. A tea regimen studied without blood-pressure medicine cannot set a safe amount for a capsule, tincture or extract used with enalapril. Uncertainty also means that a missing report of harm should not be read as proof that every preparation is safe.
What should I monitor or discuss?
Tell your pharmacist about regular hibiscus use and show the exact preparation. Mention low readings, dizziness, vomiting, diarrhea or use of diuretics because these can affect enalapril treatment. There is no established spacing interval that resolves the uncertainty. Keep prescribed medication unchanged while arranging advice; fainting requires urgent assessment.
Evidence and practical considerations
Absorption & effectiveness
Hibiscus tea can lower blood pressure in some people, but a harmful interaction with enalapril or a change in enalapril absorption has not been established. Check regular medicinal use or a concentrated extract with your pharmacist before adding it.
- Exact scope
- Oral Hibiscus sabdariffa tea or extracts with oral enalapril. Tea, aqueous calyx extract and other plant parts are not dose-equivalent. Studies of captopril or lisinopril are not direct enalapril interaction evidence. with Enalapril, RxCUI 3827, IN. Oral enalapril maleate tablets are an explicitly identified salt formulation of enalapril in the label. This bridge applies to the labeled oral prodrug; injected enalaprilat, other ACE inhibitors and combination products are not assigned this evidence automatically.
- Medication form and route
- oral
- Timing or duration
- Limited to the exposure durations described in the sources; no untested duration or timing rule is inferred.
What remains uncertain
- Human tea trial excluded blood-pressure medicines. The pharmacokinetic experiment used captopril in rats, not enalapril in people. Neither proves a clinically harmful enalapril interaction or a spacing regimen.
Factors that may matter: exact preparation and dose; baseline blood pressure; kidney function; diuretics and other medicines; dehydration.
Read the supporting source summaries
Source 1: regulatory prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed oral enalapril maleate for hypertension or heart failure.
Potassium products can substantially increase serum potassium; when indicated for documented low potassium, use cautiously with frequent testing. Dehydration and intensive diuretic treatment increase hypotension risk.
How this applies: The maleate formulation is explicitly identified as a salt of enalapril. Applies to oral enalapril, RxCUI 3827 IN; does not transfer to injected enalaprilat or another ACE inhibitor.
A drug label supports named warnings, not every botanical combination. Trial hyperkalemia rates are for enalapril treatment and do not quantify the incremental risk of potassium supplements. The inspected US label has no antacid-specific paragraph.
Source 2: primary randomized controlled trial
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 65 adults aged 30-70 with prehypertension or mild hypertension, not taking blood-pressure medicines.
Systolic pressure changed by -7.2 mmHg with tea versus -1.3 with placebo, P=0.030. Diastolic between-group difference was not significant.
How this applies: Supports a potential blood-pressure effect of brewed H. sabdariffa tea only.
No enalapril was coadministered. The tea preparation does not establish dose equivalence to concentrated extracts, drug absorption effects or symptomatic hypotension with medication.
Source 3: primary nonclinical pharmacokinetic study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Two groups of six male Sprague Dawley rats.
Captopril exposure and peak concentration decreased substantially after extract pretreatment.
How this applies: Exclusion boundary for the enalapril absorption claim, not direct support.
Wrong medication and nonhuman exposure; study does not measure enalapril or enalaprilat. Authors' captopril avoidance statement cannot be imported as enalapril advice. Abstract only.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Original sources checked and a new article prepared, distinguishing the exact medicine and supplement preparation from related studies. No independent clinical review is recorded. | |
| Research summary published |
Article revision: cb0862b4432a7383
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.