Drug & supplement interaction

Blue-green Algae + Torsemide

Torsemide brand names: Demadex, Soaanz.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Blue-green Algae and Torsemide 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

Blue-green Algae and Torsemide

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 Torsemide and Blue-green Algae 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.

Blue-green Algae safety at a glance

Blue-green Algae overall Use caution Quality varies and some products can be contaminated with toxins or heavy metals.
Pregnancy Avoid Not enough safety data and contamination risk; best to avoid.
Breastfeeding Avoid Safety is unknown and contamination is a concern; best to avoid.

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

Still wondering about combining Torsemide and Blue-green Algae? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Torsemide

Interactions in our licensed database are recorded against drug classes, not just single drug names. Torsemide is filed under 6 classifications — including loop diuretics, organic anion-transporting polypeptide substrates (oatp), diuretic drugs. Blue-green Algae has documented interactions with 3 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), antidiabetes drugs (moderate) and immunosuppressants (moderate) — and none of Torsemide’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

Blue-green Algae Does Interact With Other Medications

Blue-green Algae has 327 moderate known drug interactions in our database — Torsemide isn’t one of them. If you take anything else, check it against the full list below.

Moderate 327 No known interaction 2,503 (incl. Torsemide)
Taking anything else?

Check Another of Your Medications Against Blue-green Algae

Covers the 2,830 medications we’ve checked against Blue-green Algae. Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Blue-green Algae and Torsemide 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. One of them is worth acting on rather than waiting out — marked below.

  • An allergic reaction Worth acting on Additional detail

    Blue-green Algae

    “Orally, urticarial rashes and pruritus have occurred as part of generalized allergic reactions to blue-green algae.

    In one case report, a 14-year-old male experienced anaphylaxis with urticaria, lip edema, and asthma 6 hours after taking five tablets of spirulina blue-green algae (A. platensis, strength unknown). He had a positive skin prick test.”

    Blue-green Algae · Natural Medicines adverse-effect record, reported in allergic rhinitis (hay fever).

    3 sources cited
    1. 91706. Le TM, Knulst AC, Röckmann H. Anaphylaxis to Spirulina confirmed by skin prick test with ingredients of Spirulina tablets. Food Chem Toxicol 2014;74:309-10. PubMed
    2. 91711. Rzymski P, Niedzielski P, Kaczmarek N, Jurczak T, Klimaszyk P. The multidisciplinary approach to safety and toxicity assessment of microalgae-based food supplements following clinical cases of poisoning. Harmful Algae 2015;46:34-42. DOI
    3. 91712. Petrus M, Culerrier R, Campistron M, et al. First case report of anaphylaxis to spirulin: identification of phycocyanin as responsible allergen. Allergy 2010;65(7):924-5. PubMed

    Torsemide

    Listed in the ADVERSE REACTIONS section of the FDA label for Torsemide. Read the label on DailyMed ›

  • Itching Additional detail

    Blue-green Algae

    Recorded for Blue-green Algae in the same Natural Medicines adverse-effect record shown under An allergic reaction above.

    Torsemide

    Listed in the ADVERSE REACTIONS section of the FDA label for Torsemide. Read the label on DailyMed ›

  • Stomach pain Additional detail

    Blue-green Algae

    “Orally, gastrointestinal complaints are amongst the most common adverse effects associated with spirulina blue-green algae, including nausea, vomiting, diarrhea, and abdominal cramps. Similarly, common adverse effects associated with the blue-green algae species Aphanizomenon flos-aquae are stomach upset, flatulence, diarrhea, and bloating.”

    Blue-green Algae · Natural Medicines adverse-effect record, reported in diarrhea.

    5 sources cited
    1. 19272. Katz M, Levine AA, Kol-Degani H, Kav-Venaki L. A compound herbal preparation (CHP) in the treatment of children with ADHD: a randomized controlled trial. J Atten Disord 2010;14:281-91. PubMed
    2. 75924. Halidou, Doudou M., Degbey, H., Daouda, H., Leveque, A., Donnen, P., Hennart, P., and Dramaix-Wilmet, M. [The effect of spiruline during nutritional rehabilitation: systematic review]. Rev.Epidemiol.Sante Publique 2008;56(6):425-431.
    3. 91713. Marles RJ, Barrett ML, Barnes J, et al. United States Pharmacopeia safety evaluation of spirulina. Crit Rev Food Sci Nutr 2011;51(7):593-604. PubMed
    4. 109969. Moradi S, Zobeiri M, Feizi A, Clark CCT, Entezari MH. The effects of spirulina (Arthrospira platensis) supplementation on anthropometric indices, blood pressure, sleep quality, mental health, fatigue status and quality of life in patients with ulcerative
    5. 14842. Vitale S, Miller NR, Mejico LJ, et al. A randomized, placebo-controlled, crossover clinical trial of super blue-green algae in patients with essential blepharospasm or Meige syndrome. Am J Ophthalmol 2004;138:18-32. PubMed

    Torsemide

    Listed in the ADVERSE REACTIONS section of the FDA label for Torsemide. Read the label on DailyMed ›

Reported for Blue-green Algae but not commonly for Torsemide: muscle weakness, severe muscle breakdown, stomach upset and a severe allergic reaction.

Effects for Torsemide come from the ADVERSE REACTIONS section of its FDA label; effects for Blue-green Algae 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 Torsemide Is Prescribed For, and What Blue-green Algae Has Been Studied For

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

Torsemide is prescribed for: Torsemide tablets are used to treat edema — excess fluid buildup causing swelling — associated with heart failure, renal disease, or hepatic disease. Removing that extra fluid can relieve swelling and make breathing easier. Torsemide tablets are also used to treat high blood pressure (hypertension). Lowering blood pressure reduces the risk of serious cardiovascular events, including strokes and heart attacks.

Read the rest of what Torsemide is prescribed for

It can be used alone or alongside other blood pressure medications.

Blue-green Algae has been studied for:

  • Hypertension Natural Medicines rates the evidence for Blue-green Algae: Possibly Effective Read what the research shows

    Blue-green Algae for hypertension

    Oral blue-green algae seem to modestly reduce blood pressure 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 Torsemide on your own; if you are taking Blue-green Algae 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 Torsemide

This page covers Blue-green Algae only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Torsemide page lists 251 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Apple (major) and Grapefruit (major).

By severity: 10 major · 204 moderate · 37 minor.

From our pharmacist’s overview on the Torsemide page

“Torsemide (Demadex, Soaanz) is a water pill for fluid buildup from heart failure, kidney disease, or liver disease, and its supplement list earns genuine caution, with 10 of the 251 flagged ingredients rated major. Most entries either pile onto its blood-pressure-lowering effect or add extra diuretic action that can pull your potassium…”

Reviewed by 2 · Jul 18, 2026

Open the Torsemide interaction page

One more smart check

Taking Blue-green Algae as Part of a Dietary Supplement Product? Check It for Interactions

We hold 3,180 real supplement products containing Blue-green Algae, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Blue-green Algae. Even though Blue-green Algae itself has no known interaction with Torsemide, 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 Blue-green Algae and Torsemide 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 Blue-green Algae
Top 10%

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

29 days ago today
Medication Torsemide
Top half

#712 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 Blue-green Algae reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Blue-green Algae and Torsemide records this page draws on were last updated July 10, 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 Blue-green Algae

What is Blue-green Algae?

Blue-green Algae
  • General nutrition and energy
  • Antioxidant support
  • Cholesterol and metabolic health
  • Immune support
  • Weight management

Blue-green algae are nutrient-rich aquatic microorganisms (such as spirulina and Klamath Lake algae) taken as a supplement for energy, nutrition, and general wellness. Evidence for most health claims is limited, and some products can be contaminated with toxins or heavy metals, so quality testing matters. Talk to your pharmacist or doctor before using, especially during pregnancy or breastfeeding.

Whole dried microorganism (algae biomass) · Tablets, capsules, powder, flakes, and liquid extracts

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

Blue-green Algae: dosing

There is no official, standardized dose for blue-green algae, and the amount varies a lot from product to product. Different species and forms (tablet, powder, or liquid) also differ in strength.The safest approach is to follow the directions on the product label and not exceed them.

From our Blue-green Algae monograph — the full record covers uses, side effects and every documented interaction.

Read the full Blue-green Algae monograph & all interactions
Medication

About Torsemide

What Is Torsemide Used For?

Brand names: Demadex, Soaanz

Torsemide tablets are used to treat edema — excess fluid buildup causing swelling — associated with heart failure, renal disease, or hepatic disease. Removing that extra fluid can relieve swelling and make breathing easier.

Torsemide tablets are also used to treat high blood pressure (hypertension). Lowering blood pressure reduces the risk of serious cardiovascular events, including strokes and heart attacks. It can be used alone or alongside other blood pressure medications.

Most-Reported Side Effects for Torsemide

From FAERS, the FDA’s public side-effect reporting system (32,928 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Dyspnea 3,502 reports
Fatigue 2,188 reports
Diarrhea 2,062 reports
Nausea 2,033 reports
Dizziness 1,933 reports
See full Torsemide drug information
Keep checking

Other Drugs & Blue-green Algae

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

0Major
327Moderate
0Minor
2,502No known interaction
327 Moderate 2,502 No interaction
Moderate

327 interactions

Showing 60 of 327 moderate interactions — see all 327 on the Blue-green Algae page.

No interaction 2,502 drugs checked — show the list

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

Showing the 60 most looked-up of 2,502 medications checked with no known interaction — see the full Blue-green Algae list.

See the full Blue-green Algae interactions page
See every supplement checked against Torsemide, ranked by severity
Evidence & sources

Blue-green Algae References

The 22 references that drive our Blue-green Algae 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. Jensen GS, Ginsberg DJ, Huerta P, et al. Consumption of Aphanizomenon flos-aquae has rapid effects on the circulation and function of immune cells in humans. A novel approach to nutritional mobilization of the immune system. JANA 2000;2:50-6.
  2. Iwasa M, Yamamoto M, Tanaka Y, et al. Spirulina-associated hepatotoxicity. Am J Gastroenterol 2002;97:3212-13. PubMed
  3. Hayashi O, Katoh T, Okuwaki Y. Enhancement of antibody production in mice by dietary Spirulina platensis. J Nutr Sci Vitaminol (Tokyo) 1994;40:431-41.. PubMed
  4. Vitale S, Miller NR, Mejico LJ, et al. A randomized, placebo-controlled, crossover clinical trial of super blue-green algae in patients with essential blepharospasm or Meige syndrome. Am J Ophthalmol 2004;138:18-32. PubMed
  5. Mani UV, Desai S, Iyer U. Studies on the long-term effect of spirulina supplementation on serum lipid profile and glycated proteins in NIDDM patients. J Nutraceut 2000;2(3):25-32. DOI
  6. Chiu HF, Yang SP, Kuo YL, et al. Mechanisms involved in the antiplatelet effect of C-phycocyanin. Br J Nutr 2006;95:435-40. PubMed
  7. Hsiao G, Chou PH, Shen MY, et al. C-phycocyanin, a very potent and novel platelet aggregation inhibitor from Spirulina platensis. J Agric Food Chem 2005;53:7734-40.
  8. Katz M, Levine AA, Kol-Degani H, Kav-Venaki L. A compound herbal preparation (CHP) in the treatment of children with ADHD: a randomized controlled trial. J Atten Disord 2010;14:281-91. PubMed
  9. Madhyastha, H. K., Radha, K. S., Sugiki, M., Omura, S., and Maruyama, M. Purification of c-phycocyanin from Spirulina fusiformis and its effect on the induction of urokinase-type plasminogen activator from calf pulmonary endothelial cells. Phytomedicine PubMed
  10. Mazokopakis, E. E., Karefilakis, C. M., Tsartsalis, A. N., Milkas, A. N., and Ganotakis, E. S. Acute rhabdomyolysis caused by Spirulina (Arthrospira platensis). Phytomedicine. 2008;15(6-7):525-527. PubMed
  11. Halidou, Doudou M., Degbey, H., Daouda, H., Leveque, A., Donnen, P., Hennart, P., and Dramaix-Wilmet, M. [The effect of spiruline during nutritional rehabilitation: systematic review]. Rev.Epidemiol.Sante Publique 2008;56(6):425-431.
  12. Konno, T., Umeda, Y., Umeda, M., Kawachi, I., Oyake, M., and Fujita, N. [A case of inflammatory myopathy with widely skin rash following use of supplements containing Spirulina]. Rinsho Shinkeigaku 2011;51(5):330-333. PubMed
  13. Le TM, Knulst AC, Röckmann H. Anaphylaxis to Spirulina confirmed by skin prick test with ingredients of Spirulina tablets. Food Chem Toxicol 2014;74:309-10. PubMed
  14. Rzymski P, Niedzielski P, Kaczmarek N, Jurczak T, Klimaszyk P. The multidisciplinary approach to safety and toxicity assessment of microalgae-based food supplements following clinical cases of poisoning. Harmful Algae 2015;46:34-42. DOI
  15. Petrus M, Culerrier R, Campistron M, et al. First case report of anaphylaxis to spirulin: identification of phycocyanin as responsible allergen. Allergy 2010;65(7):924-5. 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 Blue-green Algae and Torsemide Together: Common Questions

Is it safe to take Blue-green Algae with Torsemide?
We do not list a known interaction between Blue-green Algae and Torsemide. 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 Blue-green Algae and Torsemide 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 Blue-green Algae and Torsemide 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 Blue-green Algae in each. That is a conversation for your prescriber, especially if Torsemide is being adjusted to a target.
How was the Blue-green Algae and Torsemide combination checked?
Interactions in our licensed database are recorded against drug classes. Torsemide is filed under 6 classifications, and Blue-green Algae has documented interactions with 3 drug classes — none of Torsemide'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 Blue-green Algae interact with any other medications?
Yes. Blue-green Algae has 327 documented drug interactions in our database — Torsemide 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 Torsemide interact with any supplements?
Yes. Torsemide has documented interactions with 251 supplements in our database — Blue-green Algae is not one of them. The Torsemide 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

Blue-green Algae monograph Uses, safety profile, and every drug interaction in one place Torsemide drug information The full plain-English guide to this medication Torsemide supplement interactions Every supplement checked against Torsemide, 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 22 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Torsemide and Blue-green Algae?

Our pharmacists answer your medication & supplement questions — free.

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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.