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SBRT (MRI) Side Effects

Posted by glabelle @glabelle, May 14 8:06pm

Completed five consecutive days of SBRT for my prostate cancer at UCLA almost three weeks ago. Main side effect is urination: struggling at times to get a stream started and when it does start it’s weak and short lived. Waking up almost every hour at night to pee. Doc says this is normal and should subside in the next few weeks. I’ve been taking two Flomax (.4 each) before bed and occasional ibuprofen. Was prescribed 6-day course of steroids, but holding off. For those of you who have done SBRT, what short term side effect are you experiencing and how are you dealing with/mitigating them? Thank you in advance!

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vircet | @vircet | May 21 6:12pm
In reply to @bens1 "@glabelle I had SBRT but specifically the Mridian machine, 5 treatments, with 2 mm margins so..." + (show)
@bens1

@glabelle

I had SBRT but specifically the Mridian machine, 5 treatments, with 2 mm margins so healthy tissue exposure was less than other sbrt machines that used 3-5 mm. After the 3rd treatment, my urination was a bit more difficult, so I started Flomax and overnight my stream increased. There have not been any additional side effects other than over time (I was treated in Jan-Feb of 2023), my urination flow improved.

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@glabelle & @bens1 Midway in my 5-treatment SBRT (April 9 to 21, 2025), I was asked if I experienced a burning sensation during urination. I said no. After my 5th radiation, my oncologist mentioned that my immediate side effects might peak in the 3rd or 4th week post-SBRT. I noticed some mucus and blood in my stool in the 3rd week, but it cleared on the 4th week; I had no problem when my wife and I went on a cruise this past May 12 to 19.

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scottbeammeup | @scottbeammeup | May 21 6:21pm

Exact same side effects as you. They resolved in two months.

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bens1 | @bens1 | May 21 6:49pm
In reply to @vircet "@glabelle & @bens1 Midway in my 5-treatment SBRT (April 9 to 21, 2025), I was asked..." + (show)
@vircet

@glabelle & @bens1 Midway in my 5-treatment SBRT (April 9 to 21, 2025), I was asked if I experienced a burning sensation during urination. I said no. After my 5th radiation, my oncologist mentioned that my immediate side effects might peak in the 3rd or 4th week post-SBRT. I noticed some mucus and blood in my stool in the 3rd week, but it cleared on the 4th week; I had no problem when my wife and I went on a cruise this past May 12 to 19.

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@vircet
Happy that everything went reasonably well for you. Smooth sailing😄

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