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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Why Does Myrbetriq Cause Increase In Penis Girth?

Hi, my boyfriend was prescribed Myrbetriq and has been taking it for a few days now and we had a concern as to why the medicine is causing an increase in girth of the penis and he becomes erect with no influence at all and is not able to ejaculate. It takes about an hour after sex to deflate or as long as 4 hours if no sex is involved. The internet has not provided more information about the effects of the medicine. It s getting frustrating.
Fri, 24 Oct 2014
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Radiologist,  's  Response
Hi,
Thanks for writing in.

Myrbetriq (mirabegron) reduces muscle spasms of the bladder and urinary tract.
Myrbetriq is used to treat overactive bladder with symptoms of frequent or urgent urination and urinary incontinence.
Your boyfriend must be experiencing priapism which is a potential serious condition. It is to be discussed if this is an effect of the medication that he is taking for an overactive urinary bladder or is an underlying condition in him. Please discuss with his doctor regarding sustained erection and if it is related to taking of the medication, this is termed priapism.
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Why Does Myrbetriq Cause Increase In Penis Girth?

Hi, Thanks for writing in. Myrbetriq (mirabegron) reduces muscle spasms of the bladder and urinary tract. Myrbetriq is used to treat overactive bladder with symptoms of frequent or urgent urination and urinary incontinence. Your boyfriend must be experiencing priapism which is a potential serious condition. It is to be discussed if this is an effect of the medication that he is taking for an overactive urinary bladder or is an underlying condition in him. Please discuss with his doctor regarding sustained erection and if it is related to taking of the medication, this is termed priapism.