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Myleran is a prescription medicine approved to treat chronic myelogenous leukemia (CML). It may be used for other off-label purposes at a doctor’s discretion. The medication contains busulfan as its active ingredient, a member of the class of drugs known as alkylating agents. It works by binding to the DNA of cancer cells, which stops them from growing and multiplying.
It may also help in certain pre-transplant conditioning regimens before stem cell or bone marrow transplantation (though intravenous formulations of busulfan are more commonly used for this purpose). Since it targets rapidly dividing cells, it may also affect healthy bone marrow cells.
| Product Name | Myleran |
|---|---|
| Active Ingredient | Busulfan |
| Drug Class | Alkylating agents |
| Available Forms | Oral tablets |
| Strengths Available | 2 mg |
| Routes of Administration | Taken by mouth |
| Myleran Uses | Used to treat: Chronic Myelogenous Leukemia (CML) |
| Myleran Storage | Store in a cool, dry place (below 30°C) |
| Pregnancy and Breastfeeding | Consult a doctor |
| Legal Status | Rx only |
| FDA Black Box Warning | Severe Bone Marrow Suppression (Myelosuppression) Increased Risk of Secondary Malignancies |
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Myleran is FDA-approved to treat:
Myleran (busulfan) works by forming strong chemical links between DNA strands. This DNA cross-linking disrupts replication and transcription of RNA, leading to cell death, especially in rapidly dividing cancer cells. Because it affects DNA, it can also damage normal rapidly dividing cells (like bone marrow cells), which is why close monitoring is crucial.
Keep the following Myleran precautions in mind before taking the tablets:
Note: Discuss vaccines with your doctor.
Myleran Boxed Warning:
Like other chemotherapy drugs, Myleran may cause side effects.
Consult your doctor if you experience any serious or unusual symptoms. Myleran should not be used in patients who have:
Myleran tablets should only be used under the supervision of a healthcare professional who is experienced in cancer chemotherapy. Risks and benefits should be carefully evaluated.
Myleran 2 mg tablets should always be taken after consulting your doctor. The dosage guide of Myleran (busulfan) is as follows:
FDA-Approved Dosage of Myleran (Busulfan) 2 mg Tablets for Chronic Myelogenous Leukemia (CML)
| Phase of the Treatment | Dosage | Administration | Monitoring & Important Notes |
|---|---|---|---|
| Initial (Induction) Therapy | 0.06 mg/kg/day (Maximum 4 mg/day) | Oral, usually as a single daily dose | Monitor regular blood tests (CBC) at least weekly. Continue until white blood cell (WBC) levels fall to approximately 15,000–25,000 cells/mm³ (typically at 12–20 weeks). |
| Therapy Interruption | - | Temporarily stop treatment | Interrupt if WBC falls below 15,000 cells/mm³. Closely monitor blood counts to avoid severe myelosuppression. |
| Maintenance Therapy | Typically 1–3 mg/day (individualized) | Oral, single daily dose | Restart when white blood cell count rises (often near 50,000 cells/mm³). Adjust dose based on hematologic response. |
| Dose Adjustment Consideration | Based on blood counts | Tablets are 2 mg and should not be split | When lower average daily doses are required, alternate-day dosing may be used instead of tablet splitting. |
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Important: Myleran treatment requires strict medical supervision with regular hematologic monitoring to prevent severe bone marrow suppression.
If you have taken too many Myleran doses, seek medical help immediately. Symptoms of overdose may include severe bone marrow suppression. Contact your local Poison Control Center if you suspect Myleran overdose.
If your doctor has prescribed Myleran, you should follow the medication regimen as directed. If you miss a dose of Myleran, you should:
Keep the following Myleran storage guidelines in mind:
There are several chemotherapy medications that should not be taken with other medicines. The following list shows some of the Myleran interactions:
For patients who cannot take Myleran, doctors may prescribe alternative medications. The following are the Myleran alternatives that you can take after consulting your healthcare professional:
Myleran can be costly when purchased from local U.S. pharmacies, especially for patients who require long-term treatment for chronic myelogenous leukemia (CML). At Polar Bear Meds, we help you access your prescribed medications at more affordable prices by sourcing them through fully licensed Canadian and international pharmacy partners.
When you choose to buy Myleran online from Polar Bear Meds, you may benefit from significantly lower pricing compared to many U.S. retail pharmacies — often saving a substantial percentage on your medication costs while maintaining standard pharmacy dispensing practices.
Here’s why patients trust Polar Bear Meds for their Myleran prescription:
At Polar Bear Meds, your safety and satisfaction come first. Every order is processed through licensed pharmacy partners to ensure you receive authentic Myleran medicine as prescribed by your healthcare professional. If you are seeking a trusted, affordable way to buy Myleran online, Polar Bear Meds offers a secure and cost-effective solution tailored to your needs.
The content provided about Myleran is for informational and educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Myleran (busulfan) is a prescription-based medicine and should be used only under the supervision of a healthcare professional. Always consult your doctor before changing or stopping your Myleran tablets.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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