In clinical trials, 30.6% of patients (33/108) who were not using clean intermittent catheterization (CIC) prior to injection, required catheterization for urinary retention following treatment with BOTOX® 200 Units as compared to 6.7% of patients (7/104) treated with placebo. The median duration of postinjection catheterization for these patients treated with BOTOX® 200 Units (n = 33) was 289 days (minimum 1 day to maximum 530 days) as compared to a median duration of 358 days (minimum 2 days to maximum 379 days) for patients receiving placebo (n = 7).
Botox is a drug made from a neurotoxin produced by the bacterium Clostridium botulinum called botulinum toxin. "It's a poison secreted by the bacteria," plastic surgeon Norman Rowe, M.D., tells SELF. Botulinum toxin has proven to be a successful and valuable therapeutic protein when dosage, frequency of treatment and variety of treated clinical conditions are considered, according to Howard Sobel, M.D., a dermatologist in New York. Basically: when it's done right. When it's done wrong—like, really, really wrong—it can cause "botulism-like symptoms," according to Mayo Clinic, which may include muscle weakness, trouble breathing, speaking or swallowing, bladder control issues, and vision problems. That is "very unlikely," but a more than convincing enough reason not to go bargain hunting for Botox.
According to Ravitz, it's very effective among a large sampling of her patients and is usually very well tolerated. She says some of her patients find that it even eliminates the need for medication, which is a huge deal. However, she also says, "About 7 to 10 percent of my patients find that it’s not effective and they actually feel worse during that time." As with any medical procedure, everybody (and everyone's actual body) is different and will respond to treatment differently, and it's best to do a healthy amount of research and thoroughly talk to your doctor about your body and medical history before making a decision.
Tell your doctor about all your medical conditions, including: plans to have surgery; had surgery on your face; have trouble raising your eyebrows; drooping eyelids; any other abnormal facial change; are pregnant or plan to become pregnant (it is not known if BOTOX® Cosmetic can harm your unborn baby); are breast-feeding or plan to (it is not known if BOTOX® Cosmetic passes into breast milk).