Methylene Blue 30mg
Methylene Blue 30mg is a prescription capsule containing methylene blue, a redox agent best known for treating acquired methemoglobinemia — a blood disorder that reduces oxygen delivery to tissues. It has also historically been used as a urinary antiseptic. After a licensed provider reviews your prescription, your order ships from a licensed U.S. pharmacy.
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30-day supply · $2.00/capsule
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Price: $60.00
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Methylene blue is an oxidation-reduction (redox) agent used to treat acquired methemoglobinemia and certain urinary tract conditions.
Methylene Blue 30mg Quick Facts
| Drug class | Oxidation-reduction (redox) agent |
|---|---|
| Treats | Acquired methemoglobinemia, urinary tract antiseptic (historical use) |
| Form | Capsule |
| Typical dosing | Take 1 capsule by mouth daily. |
| Prescription required | Yes — prescription only |
What Is Methylene Blue 30mg?
Methylene blue is a medication classified as an oxidation-reduction agent. Its primary FDA-recognized use is treating acquired methemoglobinemia, a condition in which an abnormal form of hemoglobin prevents red blood cells from carrying oxygen effectively. Methylene blue works by helping convert methemoglobin back to normal hemoglobin so blood can transport oxygen properly. The 30mg capsule form is dispensed by prescription and should be taken exactly as directed by your healthcare provider.
What Does Methylene Blue 30mg Treat?
Acquired methemoglobinemia
Drug-induced methemoglobinemia
Chemical-induced methemoglobinemia
Urinary tract antiseptic (historical/adjunctive use)
Diagnostic dye and visualization aid (procedural use)
Methylene Blue 30mg Dosage
Methemoglobinemia (FDA-approved injectable labeling): 1 mg/kg IV over 5–30 minutes; may repeat once after 1 hour if needed.
Oral capsules: take exactly as prescribed by your provider; dosing is individualized.
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Methylene Blue 30mg Side Effects
Common side effects
- Blue or blue-green discoloration of urine
- Blue discoloration of skin or stool
- Nausea
- Vomiting
- Headache
- Dizziness
- Altered sense of taste
- Sweating
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Serotonin syndrome (agitation, confusion, rapid heart rate, fever)
- Hemolytic anemia, especially with G6PD deficiency
- Severe allergic reaction (anaphylaxis)
- Paradoxical worsening of methemoglobinemia at high doses
- Chest pain or irregular heartbeat
Warnings & Interactions
Do not use with serotonergic drugs (SSRIs, SNRIs, MAOIs) — risk of serotonin syndrome
Contraindicated in G6PD deficiency — risk of hemolysis
Contraindicated with known hypersensitivity to methylene blue or thiazine dyes
May cause fetal harm — discuss risks if pregnant or breastfeeding
Can interfere with pulse oximetry readings
Use caution in severe renal impairment
Expect harmless blue-green discoloration of urine and stool
Tell your prescriber about all medications, supplements, and health conditions before starting methylene blue 30mg.
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