Lurbinectedin (Zepzelca) can cause a range of side effects, and the exact likelihood depends a lot on dose, schedule, prior chemo/radiation, baseline health (especially liver function), and individual factors.
That said, here’s how side effects typically break down based on clinical trial experience in people with small cell lung cancer:
Common side effects (occur in a meaningful proportion)
These are the ones most often seen:
- Low white blood cells (neutropenia) – very common
- Anemia – common
- Low platelets (thrombocytopenia) – common
- Nausea / vomiting – common
- Fatigue/weakness – common
- Diarrhea – common
- Increased liver enzymes / abnormal liver tests (ALT/AST, etc.) – common
Moderate-to-severe but less common
- Infections related to low neutrophils (febrile neutropenia can occur)
- Dehydration/electrolyte issues (often related to GI side effects)
- Liver impairment or more significant liver lab abnormalities (can be serious)
Less common but important “watch for” effects
- Serious infections
- Potential for kidney effects is less prominent than blood count/liver/GI issues, but lab changes can still occur
- Allergic/hypersensitivity reactions are less common
Severe side effects / likelihood in practice
- The most clinically significant and frequent severe issue is typically myelosuppression (low blood counts), which can be severe enough to cause treatment delays, dose reductions, growth factor use (like G-CSF), or hospital evaluation for infection.
- Liver-related effects can also become serious enough to require dose modification or delays.
Biggest predictors of side effects
Your personal likelihood is higher if you:
- Have baseline liver problems
- Have had heavy prior chemotherapy
- Start with low blood counts
- Have other conditions that increase infection risk
If you tell me a bit more, I can estimate more specifically
- Are you asking about you personally or in general?
- Do you know your dose/schedule and whether it’s for small cell lung cancer?
- Any current liver lab abnormalities or low blood counts?
Also, if you’re experiencing symptoms right now, tell me what they are (fever, sore throat, shortness of breath, yellowing eyes/skin, uncontrolled nausea/vomiting, severe diarrhea, bleeding/bruising, etc.) and when they started—I can help you gauge urgency and what to ask your oncology team.