Does cephalexin cause you urinate more often?

Yes, I noticed the change within the first 2 days of taking 500mg 4 times a day. I first experienced a sudden and surprising 2-3 days of diarrhea (once a day). Soon following I had a strong urge to urinate at least 3 times a day that lasted more than a week (I still have urges 10 days later, after stopping taking the antibiotic) The urges never woke me up in the middle of the night, but were strongest very early (between 5-6 am) which is when I usually rise. I also looked for answers at other different medical websites but Drugs.com was the only one that confirmed (from actual users) frequent urination as a side effect of cephalexin ("Keflex" in the US). I'm inclined to believe that it must indeed be a related side effect to taking the drug since I did not have any diarrhea or urinating urges prior to using it.

yes it most definitely does. I had a (broken) thumb injury at work a couple months back. I was prescribed some to take 3 times a day. After the first day I couldn't stay out of the restroom and at times barely made it. But overall it works.

Yes I was prescribed this medication 1 day ago due to a really bad uti that went to my kidneys. After 30 minutes of taking this medication I was rushing to the bathroom. After that I have been going every 30-40 minutes and barley making it to the bathroom in time. This is without barely drinking any fluids.

I am having the same issue. I have been on this for 7 days 500mg twice a day. Started with a UTI and I have been going every 45 mins for days. What the heck?!

Yes, it absolutely does. I read all I could about this medication before taking it for my UTI and excessive urination is not listed as a side effect. I started to realize that I was urinating a lot more than normal and in looking up the prevalence of this as a side effect, drugs.com is the *only* site where I have seen others report to have the same issues. I’m 4 days in and experiencing mild diarrhea. Had abdominal discomfort on the first 2 days and, for the past 2 days (maybe more), frequent peeing. Urine is clear and odorless. There is no pain or burning sensation when voiding. I feel like a sieve! As soon as I drink water, it seems I need to release it.

I thought I was crazy. I pee alot anyways, but this wakes me up constantly. I almost peed the bed the other night.

This is definitely a side effect. It was making me pee so much and actually making my urethra hurt, I went back to the doctor to ask if I could stop taking it because the peeing was driving me crazy. I was also experiencing stinging pain with the peeing. I've been off it for 24 hours now and am still experiencing this horrible side effect.

I was prescribed cephalexin at 500 mg. 3 times daily for a UTI. By the 2nd night, I was wetting the bed. I kid you not, I have never had to pee so much with a UTI in my life. I thought maybe I had something bad wrong and even called an online dr. She told me to go to my regular general practitioner... I'm reading about all the other people that have had the same side affects and now my anxieties are gone. The only thing is now I need diapers for the rest of my treatment. This is absolutely crazy! Thanks to everyone that has answered this question. Daytime is best because i know how long i can hold off..but night time waking and needing to go in a split second... no way.

I have been prescribed 250mg at bedtime for unexplained recurrent UTI in pregnancy as a daily prophylaxis until I give
birth. YES this med does cause frequent urination and all of your answers have validated the effect I am feeling as well- so thank you for posting. Yes I am
battling UTI which does cause frequent urination but I have noticed that within 10 minutes or so of taking this, I am having to go a lot more within certain time frames, than I do in the day when I am not on it- and drinking more water. Like one poster mentioned, several times per hour, and can last 5-6 hours so imagine needing to sleep but waking up
constantly to urinate. Very inconvenient and uncomfortable. Good luck to everyone.

I was prescribed this 4 days ago for a case of strep throat , I am also having the same side effect . I normally go about 2 or 3 times a day , now I'm going about 2 or 3 times every hr .cant wait to be off this

Oh my god. It was prescribed to my three year old. She’s been crying each night. Score bed begging me to find diapers and to let her go pee on a potty (where she will sit endlessly). I went to a doctor today with this issue and they had no clue what’s up. This medication is ridiculous- my little one is devastated. I have been crying each night trying to figure out what it is. Wonder who I should contact so this issue can be added as a side effect.

I have also been prescribed this medicine for a sinus infection. I noticed this right away. I am peeing all the time or feel like I have a UTI and will just pee a drop or 2. It happens right after I take the medicine and then goes away until the next dose. Good to know I am not crazy.

I started taking Cephalexin due to a UTI and I have a suprapubic catheter. Ever since I started taking it I am gushing out around the catheter excessively. I feel like a kid wetting the bed again.

Increased urination is not a known side effect or allergic reaction of cephalexin. Hope it has resolved by now. If it hasn't then I would recommend that you see your doctor ... to check that you don't have a urinary tract infection.

https://www.drugs.com/sfx/cephalexin-side-effects.html