Hi, just had my first EBRT 6 hours ago and already I’m experiencing a worsening of my urine flow. Is it normally so quick to take effect.
The first treatment can the worst for its effect on urine flow. This happened to me on the first treatment and on every Monday when I resumed treatment after the weekend break.
Note these effects can be more pronounced with SBRT compared to EBRT as the dose of radiation is higher.
Usually you will get through it and things improve on subsequent sessions but if doesn't then talk to your radiotherapy team. The usual first line of defence is Tamulosin if you are not already taking it. This is well tolerated and the effects are pretty immediate so don't hesitate to request it if you're not already taking it. You can discontinue this medication after your treatment is finished.
In more serious cases of urinary retention Intermittent or indwelling catheters may be an option.
Good Luck and I hope things improve for you.
Rob (Sandberg)
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2026 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007