Specialist treatment for some severe cases
Cyclophosphamide
An intensive option for certain organ-threatening lupus manifestations requiring close monitoring.
Select a heading to expand or collapse.
Why might it be prescribed?
May be considered for certain severe kidney or other organ disease.
What makes this medicine different?
It may be delivered by specialist infusion protocols and is not chosen simply because symptoms are troublesome.
Explore the topics that matter to you
How it works: analogy and explanation
It affects genetic material in dividing cells, including immune cells.
The analogy is a learning aid, not a literal description of biology.
How is it used and when may it help?
Schedule and route vary by specialist protocol, sometimes including intravenous infusions and bladder-protection measures.
If you miss a dose, follow the instructions for your specific product or ask your pharmacist. Do not double up without explicit advice.
Side effects and monitoring
Nausea, hair loss and fatigue can occur; low blood counts may increase infection risk.
Bladder, fertility and other organ harms are possible. Discuss fertility preservation before treatment and follow monitoring.
Which medicines may interact?
Review concurrent immune suppressants and vaccines with your team; combinations may heighten infection or blood-cell risks.
These are important examples, not a complete interaction list. Some combinations are intentional with monitoring; others may need avoidance. Bring your complete medicine list to your appointments.
Pregnancy, breastfeeding and family planning
Can harm pregnancy and fertility in women and men. Discuss contraception and fertility preservation before treatment.
When to get prompt or urgent medical help
Major fever, blood in urine, painful urination or new breathlessness require prompt medical assessment.
How does it compare with other medicines?
Teach-back: explain in your own words
Think through your answer before expanding the review notes. Nothing is recorded or sent.
During cyclophosphamide you see blood in your urine. What should you do, and why?
(+) Show review points
Seek prompt medical assessment because of possible bladder toxicity or another important condition.
Sources and clinical review status
- U.S. National Library of Medicine, MedlinePlus patient drug monograph. Read original monograph
- American College of Rheumatology (ACR). 2025 Lupus Treatment Guideline summary. Read guideline
- Fanouriakis A, et al. EULAR recommendations for SLE: 2023 update. Ann Rheum Dis. 2024;83:15–29. Read source
Last editorial update: 11 October 2026.
Clinical review: Educational draft; documented clinical review and sign-off pending. Not represented as clinically approved.
Editorial method: Plain-language explanation checked against drug monographs and lupus guidelines; examples do not replace individual medical advice.
Some monographs list approved uses other than lupus; specialist lupus use may follow clinical guidelines. External resources are in English.