I'm on gabapentin 2x a day and am experiencing loss of bladder control. Not sure if this is a side?

Genitourinary side effects including hematuria, dysuria, urination frequency, cystitis, urinary retention, urinary incontinence, vaginal hemorrhage, amenorrhea, dysmenorrhea, menorrhagia, breast cancer, inability to climax, and abnormal ejaculation have been reported infrequently. Kidney pain, leukorrhea, pruritus genital, renal stone, acute renal failure, anuria, glycosuria, nephrosis, nocturia, pyuria, urination urgency, vaginal pain, breast pain, and testicle pain have been reported rarely.[

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

I suggest you contact your Dr. in order to see if there is something he/she can do about this side effect.