What side effects can Camptosar (irinotecan) cause?
Camptosar (irinotecan) can cause a range of side effects, with some being serious enough to require prompt medical attention.
Diarrhea (including potentially dangerous “late” diarrhea)
Diarrhea is one of the best-known risks with Camptosar. It can be severe and may occur after treatment. Because it can lead to dehydration and complications, patients are usually instructed to start anti-diarrheal treatment quickly and seek care urgently if symptoms are significant.
Low white blood cells and infection risk (neutropenia)
Camptosar can lower white blood cells, particularly neutrophils. This can raise infection risk and may cause fever. Fever during chemotherapy can be an emergency because of the possibility of neutropenic fever.
Nausea, vomiting, and appetite changes
Many people experience gastrointestinal side effects such as nausea and vomiting. These are often managed with anti-nausea medicines given before or after chemotherapy.
Fatigue and weakness
Camptosar commonly causes tiredness and weakness. These symptoms can affect daily activities, especially when blood counts are low.
Hair loss (alopecia)
Some patients experience hair thinning or hair loss with irinotecan-based regimens.
Other common effects clinicians monitor
Camptosar can also be associated with additional chemotherapy-type side effects that clinicians monitor during treatment, including mouth sores and changes in blood counts.
What side effects are most concerning right away?
Contact a clinician urgently (or seek emergency care) if you develop:
- Severe diarrhea or diarrhea that doesn’t improve quickly
- Fever (especially if you are being treated for low white blood cells)
- Signs of dehydration (dizziness, extreme weakness, very low urine output)
Do side effects differ depending on the dosing schedule or combination?
Side effects can vary based on:
- The Camptosar dose and schedule
- Whether it’s used with other chemotherapy or targeted agents
- Patient factors such as age and baseline blood counts and liver function
If you tell me your regimen (for example, whether Camptosar is paired with 5-FU/leucovorin or another drug) and what side effects you’re seeing, I can tailor what’s most likely and what typically needs urgent evaluation.