If the musculature of the oropharynx and esophagus are affected, aspiration may occur which may lead to development of aspira tion pneumonia. If the respiratory muscles become paralyzed or sufficiently weakened, intubation and assisted respiration may be necessary until recovery takes place. Supportive care could involve the need for a tracheostomy and/or prolonged mechanical ventilation, in addition to other general supportive care.
A double-blind, placebo-controlled study enrolled patients who had extended histories of receiving and tolerating BOTOX injections, with prior individualized adjustment of dose. The mean BOTOX dose administered to patients in this study was 236 Units (25th to 75th percentile range of 198 Units to 300 Units). The BOTOX dose was divided among the affected muscles [see Clinical Studies].
In general, the initial effect of the injections is seen within three days and reaches a peak at one to two weeks post-treatment. Each treatment lasts approximately three months, following which the procedure can be repeated. At repeat treatment sessions, the dose may be increased up to two-fold if the response from the initial treatment is considered insufficient, usually defined as an effect that does not last longer than two months. However, there appears to be little benefit obtainable from injecting more than 5 Units per site. Some tolerance may be found when BOTOX is used in treating blepharospasm if treatments are given any more frequently than every three months, and is rare to have the effect be permanent.
Of 1242 overactive bladder patients in placebo-controlled clinical studies of BOTOX, 41.4% (n=514) were 65 years of age or older, and 14.7% (n=182) were 75 years of age or older. Adverse reactions of UTI and urinary retention were more common in patients 65 years of age or older in both placebo and BOTOX groups compared to younger patients (see Table 18). Otherwise, there were no overall differences in the safety profile following BOTOX treatment between patients aged 65 years and older compared to youn ger patients in these studies.
The results usually start to be noticed within three to 10 days or even sooner. They tend to last in most people for up to three or four months. As time passes, the muscle activity will gradually return to normal. Additionally, other areas may return to activity over time, depending on the amount injected. The interesting thing about Botox is that it tends to work fairly well even up to the third month, as a procedure that might last a very short time at full strength and then go away quickly (filler injections such as Restylane, Perlane, or Juvederm tend to last approximately six to 12 months, depending on the amount used).

So when I first propositioned my husband about the idea of me getting a bit of Botox for the furrowed brow I've earned from a decade of writing and editing behind a computer screen, he was adamantly against it. And frankly, I was a bit scared too. I mean, isn't Botox poison? As an idealistic 21 year old, it was easy to say that I'd never put that stuff in my body, that "poison." Now, I'm not so sure.
It is not known whether BOTOX® is safe or effective to treat increased stiffness in upper limb muscles other than those in the elbow, wrist, fingers, and thumb, or in lower limb muscles other than those in the ankle and toes. BOTOX® has not been shown to help people perform task-specific functions with upper limbs or increase movement in joints that are permanently fixed in position by stiff muscles. BOTOX® is not meant to replace existing physical therapy or other rehabilitation that may have been prescribed.