How long does chemotherapy take to work for glioblastoma?

The timing depends on whether chemotherapy is given after surgery, alongside radiotherapy, or later in the treatment pathway. MRI scans are usually compared with earlier images, but swelling and treatment effects can sometimes make interpretation difficult. A symptom change alone cannot confirm that the tumour is growing or shrinking.

Your neuro-oncology team may review the scan with changes in headaches, seizures, strength, speech, vision, memory, and daily function. They may also consider steroid use and other treatment effects because these can influence symptoms and scan appearance.

The next step may be to continue treatment, repeat imaging after a planned interval, adjust medicines, or discuss another option. Ask the team what finding they are monitoring and when the result will be reviewed with you.

Take chemotherapy, anti-seizure medicines, steroids, and other prescribed medicines exactly as directed. Keep a dated record of headaches, seizures, weakness, balance, speech, vision, mood, and steroid side effects. Bring the list to each appointment and do not change steroid doses without medical advice.

Arrange help with tasks if balance, concentration, or fatigue is affected. Ask about driving, work, infection precautions, and who can answer questions between scans. Continue attending blood tests and imaging even when you feel well.

Call your oncology team promptly for a new or worsening headache, repeated vomiting, increasing drowsiness, a new seizure, confusion, weakness, numbness, speech difficulty, or a change in vision. These symptoms can reflect swelling, seizure activity, treatment effects, or another urgent problem.

Seek emergency care for a seizure that does not stop, loss of consciousness, severe breathing difficulty, sudden severe weakness, or inability to wake normally. Tell responders that you have glioblastoma and are receiving chemotherapy.

Ask when your next MRI is due, how treatment effects will be distinguished from tumour change, which symptoms should prompt a same-day call, and whether steroid or anti-seizure doses need review. Ask who will explain the scan result and when.