Drug & supplement interaction

Beet + Dorzolamide, Timolol

Dorzolamide, Timolol brand name: Cosopt.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Beet and Dorzolamide, Timolol in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Beet and Dorzolamide, Timolol

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Dorzolamide, Timolol and Beet in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Beet safety at a glance

Beet overall Generally safe Beet is widely eaten as a food and is generally well tolerated for most adults.
Pregnancy Use caution Beet as a food is fine, but concentrated supplements lack safety data, so use caution.
Breastfeeding Use caution Beet as a food is fine, but there is not enough data on concentrated supplements.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Dorzolamide, Timolol and Beet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Dorzolamide, Timolol

Interactions in our licensed database are recorded against drug classes, not just single drug names. Dorzolamide, Timolol is filed under 4 classifications — including beta-blockers, cytochrome p450 2d6 (cyp2d6) substrates, topical drugs. Beet has documented interactions with 3 drug classes — the most serious being cytochrome p450 3a4 (cyp3a4) substrates (moderate), antihypertensive drugs (minor) and cytochrome p450 1a2 (cyp1a2) substrates (minor) — and none of Dorzolamide, Timolol’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Beet Does Interact With Other Medications

Beet has 643 moderate, 218 minor known drug interactions in our database — Dorzolamide, Timolol isn’t one of them. If you take anything else, check it against the full list below.

Moderate 643 Minor 218 No known interaction 1,969 (incl. Dorzolamide, Timolol)
Taking anything else?

Check Another of Your Medications Against Beet

Covers the 2,830 medications we’ve checked against Beet. Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Beet and Dorzolamide, Timolol May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Diarrhea / Vomiting / Nausea Additional detail

    Beet

    “Orally, beet juice may cause red stools. This red coloring of the stools is not harmful. Additionally, beet supplementation has been reported to cause black stools. In one case, a 79-year-old male on apixaban and clopidogrel presented with black stools, nausea, and vomiting after taking beet pills 2-3 days prior.”

    Beet · Natural Medicines adverse-effect record, reported in anemia.

    6 sources cited
    1. 94470. Siervo M, Lara J, Ogbonmwan I, Mathers JC. Inorganic nitrate and beetroot juice supplementation reduces blood pressure in adults: a systematic review and meta-analysis. J Nutr 2013;143:818-26. PubMed
    2. 97726. Wylie LJ, Kelly J, Bailey SJ, et al. Beetroot juice and exercise: pharmacodynamic and dose-response relationships. J Appl Physiol (1985). 2013;115(3):325-36. PubMed
    3. 100142. Garnacho-Castaño MV, Palau-Salvà G, Cuenca E, et al. Effects of a single dose of beetroot juice on cycling time trial performance at ventilatory thresholds intensity in male triathletes. J Int Soc Sports Nutr. 2018;15(1):49. PubMed
    4. 100145. Rasica L, Porcelli S, Marzorati M, et al. Ergogenic effects of beetroot juice supplementation during severe-intensity exercise in obese adolescents. Am J Physiol Regul Integr Comp Physiol. 2018;315(3):R453-R460. PubMed
    5. 105762. Serra-Payá N, Garnacho-Castaño MV, Sánchez-Nuño S, et al. The relationship between resistance exercise performance and ventilatory efficiency after beetroot juice intake in well-trained athletes. Nutrients 2021;13(4):1094. PubMed
    6. 113426. Oscherwitz M, Tamayo RM, Heudebert A, Centor R. A Case of Pseudo-Hematochezia from Beet Supplement Ingestion. Am J Med 2023;136(9):e177-e178. PubMed

    Dorzolamide, Timolol

    Listed in the ADVERSE REACTIONS section of the FDA label for Dorzolamide, Timolol. Read the label on DailyMed ›

Reported for Beet but not commonly for Dorzolamide, Timolol: kidney problems, constipation, bleeding in the gut and anemia.

Effects for Dorzolamide, Timolol come from the ADVERSE REACTIONS section of its FDA label; effects for Beet come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Overlapping uses

What Dorzolamide, Timolol Is Prescribed For, and What Beet Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Dorzolamide, Timolol is a prescription medicine with approved uses on its FDA label. Beet is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Dorzolamide, Timolol is prescribed for: Dorzolamide and timolol ophthalmic eye drops are used to reduce elevated intraocular pressure (pressure inside the eye) in people with open-angle glaucoma or ocular hypertension (higher-than-normal eye pressure without signs of glaucoma damage). It is specifically intended for patients who have not responded well enough to beta-blocker eye drops alone. This combination is available as Cosopt, Cosopt PF, and Dorzolamide Hydrochloride and Timolol Maleate eye drops. Cosopt PF is the preservative-free formulation, which may be preferred for people sensitive to preservatives.

Beet has been studied for:

  • Hypertension studied, not established Beet has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Beet for hypertension

    Oral beet may slightly reduce blood pressure in healthy individuals, but it is unclear if it is beneficial in patients with hypertension.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Dorzolamide, Timolol on your own; if you are taking Beet for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Dorzolamide, Timolol

This page covers Beet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Dorzolamide, Timolol page lists 71 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Indian Snakeroot (major), 1,3-dmaa (moderate), Acacia Rigidula (moderate), Active Hexose Correlated Compound (ahcc) (moderate) and Ayahuasca (moderate).

By severity: 1 major · 59 moderate · 11 minor.

From our pharmacist’s overview on the Dorzolamide, Timolol page

“Indian snakeroot is the one entry here I would treat as a genuine hazard with Cosopt (dorzolamide and timolol), the glaucoma eye drop. Its reserpine content plus a beta-blocker like timolol could slow the heart or drop blood pressure too far, and it holds the only major rating among the 71 supplements and herbs on file.”

Reviewed by 2 · Jul 18, 2026

Open the Dorzolamide, Timolol interaction page

One more smart check

Taking Beet as Part of a Dietary Supplement Product? Check It for Interactions

We hold 4,785 real supplement products containing Beet, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Beet. Even though Beet itself has no known interaction with Dorzolamide, Timolol, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Beet and Dorzolamide, Timolol Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Beet
Top 5%

#38 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Dorzolamide, Timolol
Top half

#727 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Beet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Beet and Dorzolamide, Timolol records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Beet

What is Beet?

Beet
  • High blood pressure
  • Exercise and athletic performance
  • Heart and circulation support
  • General antioxidant/anti-inflammatory support
  • Liver and digestive support

Beet, especially beetroot juice, is a nitrate-rich food that may modestly lower blood pressure and slightly improve exercise performance in some people. It is generally safe as a food, but supplement effects are modest and not a substitute for prescribed treatment, so talk with your pharmacist or doctor before relying on it.

Beta vulgaris · Amaranthaceae · Root and leaves (greens) · Juice, powder, capsules, tablets, whole food, concentrated shots, gels

An interaction check asks whether these two react with each other — it does not ask whether Beet is a good idea for someone in your situation. Here is what our Beet record says about it on its own.

Beet: dosing

There is no official standardized dose of beet for supplement use. Studies have used a range of amounts of beetroot juice or powder, often based on nitrate content, but the best dose is not firmly established.If you choose a beet supplement, follow the directions on the product label and do not exceed the recommended amount.

From our Beet monograph — the full record covers uses, side effects and every documented interaction.

Read the full Beet monograph & all interactions
Medication

About Dorzolamide and Timolol Ophthalmic

What Is Dorzolamide and Timolol Ophthalmic Used For?

Brand name: Cosopt

Dorzolamide and timolol ophthalmic eye drops are used to reduce elevated intraocular pressure (pressure inside the eye) in people with open-angle glaucoma or ocular hypertension (higher-than-normal eye pressure without signs of glaucoma damage). It is specifically intended for patients who have not responded well enough to beta-blocker eye drops alone.

This combination is available as Cosopt, Cosopt PF, and Dorzolamide Hydrochloride and Timolol Maleate eye drops. Cosopt PF is the preservative-free formulation, which may be preferred for people sensitive to preservatives.

See full Dorzolamide and Timolol Ophthalmic drug information
Keep checking

Other Drugs & Beet

Browse every other medication we’ve checked against Beet — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
643Moderate
218Minor
1,968No known interaction
643 Moderate 218 Minor 1,968 No interaction
Moderate

643 interactions

Showing 60 of 643 moderate interactions — see all 643 on the Beet page.

Minor

218 interactions

Showing 60 of 218 minor interactions — see all 218 on the Beet page.

No interaction 1,968 drugs checked — show the list

We also checked Beet against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 1,968 medications checked with no known interaction — see the full Beet list.

See the full Beet interactions page
See every supplement checked against Dorzolamide, Timolol, ranked by severity
Evidence & sources

Beet References

The 14 references that drive our Beet monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  2. Clifford T, Berntzen B, Davison GW, et al. Effects of beetroot juice on recovery of muscle function and performance between bouts of repeated sprint exercise. Nutrients 2016;8. pii: E506. PubMed
  3. Siervo M, Lara J, Ogbonmwan I, Mathers JC. Inorganic nitrate and beetroot juice supplementation reduces blood pressure in adults: a systematic review and meta-analysis. J Nutr 2013;143:818-26. PubMed
  4. Clifford T, Howatson G, West DJ, Stevenson EJ. Beetroot juice is more beneficial than sodium nitrate for attenuating muscle pain after strenuous eccentric-bias exercise. Appl Physiol Nutr Metab. 2017;42(11):1185-1191. PubMed
  5. Clifford T, Bell O, West DJ, Howatson G, Stevenson EJ. The effects of beetroot juice supplementation on indices of muscle damage following eccentric exercise. Eur J Appl Physiol. 2016;116(2):353-62. PubMed
  6. Wylie LJ, Kelly J, Bailey SJ, et al. Beetroot juice and exercise: pharmacodynamic and dose-response relationships. J Appl Physiol (1985). 2013;115(3):325-36. PubMed
  7. Garnacho-Castaño MV, Palau-Salvà G, Cuenca E, et al. Effects of a single dose of beetroot juice on cycling time trial performance at ventilatory thresholds intensity in male triathletes. J Int Soc Sports Nutr. 2018;15(1):49. PubMed
  8. Rasica L, Porcelli S, Marzorati M, et al. Ergogenic effects of beetroot juice supplementation during severe-intensity exercise in obese adolescents. Am J Physiol Regul Integr Comp Physiol. 2018;315(3):R453-R460. PubMed
  9. Henrohn D, Björkstrand K, Lundberg JO, et al. Effects of oral supplementation with nitrate-rich beetroot juice in patients with pulmonary arterial hypertension-results from BEET-PAH, an exploratory randomized, double-blind, placebo-controlled, crosso
  10. Serra-Payá N, Garnacho-Castaño MV, Sánchez-Nuño S, et al. The relationship between resistance exercise performance and ventilatory efficiency after beetroot juice intake in well-trained athletes. Nutrients 2021;13(4):1094. PubMed
  11. Haron MH, Dale O, Martin K, et al. Evaluation of the Herb-Drug Interaction Potential of Commonly Used Botanicals on the US Market with Regard to PXR- and AhR-Mediated Influences on CYP3A4 and CYP1A2. J Diet Suppl 2022. PubMed
  12. Hemmatinafar M, Zaremoayedi L, Koushkie Jahromi M, et al. Effect of Beetroot Juice Supplementation on Muscle Soreness and Performance Recovery after Exercise-Induced Muscle Damage in Female Volleyball Players. Nutrients 2023;15(17):3763. PubMed
  13. Lim SH, Bae S, Lee HS, Han HK, Choi CI. Effect of Betanin, the Major Pigment of Red Beetroot (Beta vulgaris L.), on the Activity of Recombinant Human Cytochrome P450 Enzymes. Pharmaceuticals (Basel) 2023;16(9):1224. PubMed
  14. Oscherwitz M, Tamayo RM, Heudebert A, Centor R. A Case of Pseudo-Hematochezia from Beet Supplement Ingestion. Am J Med 2023;136(9):e177-e178. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Beet and Dorzolamide, Timolol Together: Common Questions

Is it safe to take Beet with Dorzolamide, Timolol?
We do not list a known interaction between Beet and Dorzolamide, Timolol. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Beet and Dorzolamide, Timolol have any of the same side effects?
Yes — our sources link each of them separately to 3 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Are Beet and Dorzolamide, Timolol used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Beet in each. That is a conversation for your prescriber, especially if Dorzolamide, Timolol is being adjusted to a target.
How was the Beet and Dorzolamide, Timolol combination checked?
Interactions in our licensed database are recorded against drug classes. Dorzolamide, Timolol is filed under 4 classifications, and Beet has documented interactions with 3 drug classes — none of Dorzolamide, Timolol's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Beet interact with any other medications?
Yes. Beet has 861 documented drug interactions in our database — Dorzolamide, Timolol is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Dorzolamide, Timolol interact with any supplements?
Yes. Dorzolamide, Timolol has documented interactions with 71 supplements in our database — Beet is not one of them. The Dorzolamide, Timolol interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Beet monograph Uses, safety profile, and every drug interaction in one place Dorzolamide and Timolol Ophthalmic drug information The full plain-English guide to this medication Dorzolamide, Timolol supplement interactions Every supplement checked against Dorzolamide, Timolol, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 14 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Dorzolamide, Timolol and Beet?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.