Cyclophosphamide in the bedroom

At a glance

What it is

Cyclophosphamide is one of the most widely used chemotherapy drugs — a nitrogen-mustard alkylating agent given for several cancers and some immune conditions. It is itself classified by IARC as a Group 1 carcinogen (it can cause secondary cancers), which is why it is handled as a hazardous drug in healthcare settings, with closed-system transfer devices and protective equipment recommended by NIOSH and the U.S. Pharmacopeia. Peer-reviewed — IARC, Group 1 Regulatory — NIOSH, USP <800>

For an atlas about the chemistry of the bedroom, cyclophosphamide matters because of what happens after a dose. The body does not fully retain it: roughly a quarter of a dose is excreted unchanged in urine within 24 hours, and it is also excreted in sweat. That means the drug reaches the skin surface and the textiles in contact with it — exactly the body-to-textile pathway that this Atlas exists to document.

The body-to-textile transfer evidence

Measured on patients' clothing via sweat

The clearest single piece of evidence comes from a 2022 study that measured cyclophosphamide on the cotton undershirts of patients receiving CHOP chemotherapy, worn from the start of therapy through 24 hours after the dose. Cyclophosphamide was detected on the undershirts of all patients, at concentrations from 7.38 to 160.77 ng/cm² — establishing that sweat, not only urine, deposits the drug onto textiles in direct skin contact. Peer-reviewed — Sweat-exposure study 2022, PMID 36514300 This is the strongest, most direct demonstration in the entire Atlas that a compound moves from the body onto the fabric a person wears and sleeps against.

Secondary exposure of family members and caregivers

Because the drug reaches textiles, surfaces, and bodily fluids, it can reach the people who share a home with a patient. A pilot study of outpatients' families detected cyclophosphamide in the urine of family members, and a study of caregivers of pediatric patients detected it in the urine of a meaningful fraction of caregivers, peaking 24–48 hours after a dose. Peer-reviewed — Secondary family exposure, PMID 26488834; caregiver exposure, PMID 38870739 The measured amounts are low, but the detection is the point: it confirms the patient-to-household transfer the textile measurements predict.

What this establishes for the Atlas

Cyclophosphamide is the proof-of-principle for the whole body-to-textile premise: a compound carried in sweat and excreta deposits onto clothing and bedding at measurable levels, and can reach household contacts. Peer-reviewed It is an extreme case — a potent, measurable, regulated drug — but the mechanism it demonstrates (skin and bodily fluids loading textiles) is the same mechanism that underlies the rest of this Atlas's interest in what ends up on the sleep surface.

What the research says

It is a regulated occupational hazard

NIOSH lists cyclophosphamide among antineoplastic and other hazardous drugs, and surface-contamination studies in hospital pharmacies repeatedly detect it — sometimes persisting after cleaning — which is why closed-system transfer devices and strict handling protocols exist. Regulatory — NIOSH, USP The occupational framework is well-developed; the household side is less formalized but is what the secondary-exposure studies address.

Laundering reduces it

A pilot study evaluated washing methods for cyclophosphamide-contaminated linens against a 1 ng/cm² benchmark, informing guidance on how to launder soiled items. Peer-reviewed — Washing study, PMID 37267487 Standard cancer-care guidance already includes handling and laundering precautions for the days after a dose; the research supports that those precautions meaningfully reduce contamination.

Reducing secondary exposure

These are documented household- and occupational-hygiene measures — the kind already found in cancer-care guidance — not medical advice; patients and caregivers should follow their own care team's instructions.

Follow the care team's household-precaution guidance during and after treatment. Most chemotherapy programs provide specific instructions for the days after a dose, when excretion is highest; those instructions are the authoritative source.

Handle soiled linens and clothing with gloves and launder them separately. The washing research supports separate laundering of visibly soiled items during the high-excretion window.

Use waterproof mattress and pillow protectors that can be wiped or laundered. A washable barrier limits how much reaches the mattress itself and makes cleanup easier.

Ventilate and clean surfaces. General hygiene reduces the surface and dust reservoirs that secondary-exposure studies measure.

Open research questions

• How much cyclophosphamide accumulates specifically in a patient's mattress and bedding over a treatment course, and how long it persists. Speculation
• The real-world reduction in household secondary exposure achieved by specific bedding-hygiene practices. Speculation

Citations

1. IARC. Cyclophosphamide — Group 1 (carcinogenic to humans). Peer-reviewed
2. Cyclophosphamide exposure via sweat of patients receiving CHOP therapy (2022) — detected on patient undershirts at 7.38–160.77 ng/cm². PMID 36514300 Peer-reviewed
3. Secondary Exposure of Family Members to Cyclophosphamide After Chemotherapy of Outpatients With Cancer: A Pilot Study. PMID 26488834 Peer-reviewed
4. Cyclophosphamide exposure factors in family caregivers for pediatric cancer patients (2024). PMID 38870739 Peer-reviewed
5. The Effectiveness of Washing Clothing Contaminated With Cyclophosphamide: A Pilot Study. PMID 37267487 Peer-reviewed
6. NIOSH. List of Antineoplastic and Other Hazardous Drugs in Healthcare Settings; USP <797>/<800> handling guidance. Regulatory

Frequently asked questions

• Why is a chemotherapy drug in the Bedroom Chemistry Atlas?

  Because cyclophosphamide is the clearest documented example of a compound moving from a person's body onto the textiles they sleep and live in. Patients excrete the drug in urine and sweat, and researchers have measured it directly on patients' clothing. This page describes that documented secondary (environmental) exposure — an occupational- and household-hygiene topic. It is not medical advice about cancer treatment, and nothing here implies any product treats, prevents, or affects cancer or its therapy.

• How does cyclophosphamide get onto clothing and bedding?

  Patients receiving cyclophosphamide excrete it and its metabolites in urine and sweat — roughly a quarter of a dose leaves unchanged in urine within 24 hours. A 2022 study measuring patients' cotton undershirts during CHOP therapy detected cyclophosphamide in the undershirts of all patients, at 7.38 to 160.77 ng/cm², showing that sweat as well as urine deposits the drug onto textiles in direct skin contact.

• Can family members be exposed?

  Studies of secondary exposure have detected cyclophosphamide in the urine of family members and caregivers of treated patients, including a meaningful fraction of caregivers of pediatric patients. The amounts are low, but the detection establishes that the drug can move from patient to household contact via contaminated textiles, surfaces, and bodily fluids. This is why cancer-care guidance includes household-hygiene precautions during and after treatment.

• Does washing remove it?

  A pilot study tested washing methods for cyclophosphamide-contaminated linens against a 1 ng/cm² benchmark. Laundering reduces contamination, and standard guidance is to handle and wash visibly soiled linens separately, with gloves, during the days after a dose. Following the laundering and handling precautions in cancer-care guidance is the documented way to reduce this secondary exposure.

• Is this a risk for the general public?

  No. This is specific to households of patients receiving the drug and to healthcare workers who handle it — not the general public. NIOSH lists cyclophosphamide among hazardous drugs requiring occupational controls, and the secondary-exposure literature is centered on patients' families and caregivers. The Atlas includes it because it is the strongest evidence that body chemistry transfers onto textiles, not because it is a broad consumer exposure.

Related compounds

• 5-Fluorouracil (5-FU) — another widely used chemotherapy drug excreted by patients and monitored for environmental contamination
• BPA — the keystone evidence for the dietary-to-sweat-to-textile pathway in the general population
• Benzene — another IARC Group 1 compound, here from environmental rather than pharmaceutical sources

This Atlas entry describes documented environmental and secondary exposure science. It is not medical advice; patients and caregivers should follow their care team's guidance. Last reviewed 2026-06-27. If you find a factual error, contact us.