R-CHOP Day by Day: What to Expect

R-CHOP is rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone. The letters come from older drug names: H for hydroxydaunorubicin, which is doxorubicin, and O for Oncovin, which is vincristine.

Rituximab is not chemotherapy. It is an antibody that attaches to CD20, a protein on the surface of B cells, and marks them for destruction. The other four are chemotherapy or steroid. Rituximab goes first on day 1, and it takes the longest.

A cycle is usually 21 days. For diffuse large B-cell lymphoma the rituximab label allows up to 8 infusions, one on day 1 of each cycle. Diffuse large B-cell lymphoma covers how many cycles are chosen.

Hepatitis B screening is not optional. The rituximab label carries a boxed warning about hepatitis B reactivation, which has caused liver failure and death. It instructs that all patients be screened by measuring HBsAg and anti-HBc before starting. That includes people who believe a past infection cleared, because reactivation has happened in that group too.

Heart function is the second. Doxorubicin carries a boxed warning for cardiomyopathy. Its label instructs that left ventricular ejection fraction be assessed before treatment, regularly during it, and after it finishes. Usually that means an echocardiogram or a MUGA scan.

A complete blood count with platelets is also drawn before the first dose.

Expect a long first day. Plan for the whole day, not a morning.

You will be premedicated with an antihistamine and acetaminophen. Then the first rituximab infusion begins at a deliberately slow drip rate. If nothing goes wrong, the nurse steps it up every 30 minutes until it reaches the ceiling the label sets. Getting to full rate therefore takes hours by design.

Infusion reactions are common on this first dose and much less common later. The label reports them in 77% of patients during the first rituximab infusion, with a falling rate on each later one. They typically start 30 to 120 minutes in, with fever, chills or rigors, itching, flushing, low blood pressure, or wheezing. Most settle when the infusion is slowed or paused and supportive care is given.

Later cycles are faster. Subsequent infusions start at a higher rate and are stepped up in bigger jumps every 30 minutes. From cycle 2, if you had no severe reaction in cycle 1, a 90-minute infusion is an option. The label reports grade 3 to 4 reactions in 1.1% of patients at that cycle 2 rapid infusion.

Once rituximab is finished, the chemotherapy runs. Cyclophosphamide, then doxorubicin, then vincristine, though the order after rituximab varies by center.

Doxorubicin is a vesicant. If it leaks out of the vein it can cause tissue death severe enough to need wide surgical removal and a skin graft. The label says to stop immediately and apply ice. Tell the nurse at once about burning, stinging, or swelling at the IV site. Do not wait to see if it settles.

Vincristine arrives in a small plastic bag, not a syringe. That is deliberate. Its label carries the instruction in capital letters: for intravenous use only, fatal if given by other routes. Diluting it into a bag and labeling it that way is a national safety measure to prevent it ever being injected into spinal fluid.

Prednisone is taken by mouth at home for the first several days of the cycle. Your prescription states the exact dose and number of days. Confirm both before you leave, because this is the one part of R-CHOP nobody supervises.

Steroids produce a recognizable pattern: appetite, restlessness, poor sleep, and sometimes an unusually good mood. Then the tablets stop, and days 6 and 7 often bring a slump. Knowing that crash is expected makes it easier to sit through.

Cyclophosphamide can irritate the bladder lining. Its label describes hemorrhagic cystitis, along with pyelitis, ureteritis, and blood in the urine, and states that urotoxicity can be fatal. It also gives the countermeasures: aggressive hydration with forced diuresis and frequent bladder emptying reduce how often and how badly this happens. Mesna is used to prevent severe bladder toxicity.

The practical version: drink steadily and empty your bladder rather than holding it, especially overnight.

Doxorubicin turns urine red for 1 to 2 days after the infusion. The label says patients should be told this. It is dye, not blood.

Vincristine slows the gut. Its label recommends a routine preventive regimen against constipation for every patient receiving it. It also warns that constipation can present as a high impaction, with colicky pain and an empty rectum on examination, which can mislead. Paralytic ileus and even bowel perforation have been reported. Start the laxative plan on day 1, not on day 5 when nothing has moved.

White cells usually reach their lowest point in this window. This is when infection risk peaks and when a fever becomes an emergency rather than an inconvenience. Low white blood cells during chemotherapy explains what the counts mean.

If your lymphoma is bulky or your white cell count is very high, cells can break apart fast enough to flood the blood with potassium, phosphate, and uric acid. The rituximab label states this can occur within 12 to 24 hours after the first infusion, and that a circulating malignant cell count of 25,000/mm3 or higher, or a high tumor burden, raises the risk.

Prevention is fluids, allopurinol or rasburicase, and blood tests over the first days. Tumor lysis syndrome covers the warning signs.

Two numbers accumulate rather than reset.

Doxorubicin's heart risk is cumulative. Its label reports cardiomyopathy in 1% to 20% of patients at cumulative doses between 300 and 500 mg/m2 when given every 3 weeks. Ask what your running total is and what the planned ceiling is.

Both doxorubicin and cyclophosphamide raise the long-term risk of a second blood cancer. The doxorubicin label names secondary acute myeloid leukemia and myelodysplastic syndrome. The cyclophosphamide label adds urinary tract cancer among others, and notes that preventing hemorrhagic cystitis may reduce bladder cancer risk. These are small risks against a treatment given to cure, but they belong in the conversation, not in a footnote.

• Your temperature reaches 100.4 degrees F (38 C). MedlinePlus, reviewed October 2024, uses 100.4 F; NCI's infection page, reviewed January 2020, uses 100.5 F. Use the lower, newer number.
• You see visible blood or clots in your urine, or it burns to pass urine.
• You have had no bowel movement for 3 days, or you have abdominal pain with no gas passing.
• You feel breathless lying flat, your ankles swell, or your heart races at rest.
• Numbness or tingling reaches past your fingertips, or you trip on stairs or catch your toes.
• Your IV site from the last infusion becomes red, firm, blistered, or increasingly painful.

• https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=b172773b-3905-4a1c-ad95-bab4b6126563
• https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=1fd148fb-0fbc-4b6f-b790-23546fb46a71
• https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=b22e4c8e-dbe1-4d4b-a026-e1812974071c
• https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=571a5a63-fb66-0617-e063-6394a90a2d04
• https://www.cancer.gov/about-cancer/treatment/side-effects/infection
• https://medlineplus.gov/ency/patientinstructions/000913.htm