Extraocular muscles adjacent to the injection site can be affected, causing vertical deviation, especially with higher do ses of BOTOX. The incidence rates of these adverse effects in 2058 adults who received a total of 3650 injections for horizontal strabismus was 17%. The incidence of ptosis has been reported to be dependent on the location of the injected muscles, 1% after inferior rectus injections, 16% after horizontal rectus injections and 38% after superior rectus injections.

The range of prices for a single unit of Botox range between $10 and $20 per unit. But the total cost of Botox treatment depends on exactly what you're trying to achieve. For example, the cost of treating horizontal forehead lines may range anywhere from $300 to $700 depending on the factors mentioned above. For other facial areas you may need fewer units.
Botox only lasts three to six months—and yet what's less commonly discussed is this: Facial muscles naturally weaken over time and going overboard in a certain area could have unwanted consequences. "If you do too much Botox on your forehead for many, many years, the muscles will get weaker and flatter," cautions Wexler, adding that the skin can also appear thinner and looser. Moreover, as your muscles become weaker, they can start to recruit surrounding muscles when you make facial expressions. "If one stops using their forehead muscles, they may start squinting using their nose and have wrinkles along the side of their nose," she explains. Translation: You need even more Botox for the newly recruited muscles, says Wexler. To avoid these kind of missteps, researching a doctor diligently is essential, as is approaching injectables conservatively, and asking questions about how the treatment will be tailored to your needs.
Aesthetician Mary Schook is anti-Botox because she sees the long-term effects on her clients. “Everyone is always like, ‘Look how great this looks,’ and then there is the long-term and they are like, 'Fix me,'” she says. “Allergan [the company that owns Botox] says one in 100 patients gets eyelid-drop, so I always joke, ‘I must meet one in 100 patients, because everyone I see has that drop.'”

Botox was introduced to the world in the late 1980s by ophthalmologists, who began using it to treat optic muscle disorders. It was approved by the Food and Drug Administration (FDA) for the treatment of moderate to severe frown lines between the eyebrows (glabellar lines) in 2002, and its popularity has soared ever since. Botox is consistently one of the top five nonsurgical cosmetic procedures performed each year.
For most of our guests, the effects of the treatment can last anywhere from 3-6 months. Many factors can influence how long the effects last. As the product wears off, muscle action returns gradually, & the previously treated lines & wrinkles may begin to reappear, and need to be treated again. With repeated treatment, the lines and wrinkles often appear less severe than before, as the muscles are being trained to relax.Some of these factors that may shorten or lengthen the effects include:
Most physicians pay roughly the same amount of money to purchase a vial of Botox. However, the cost of a Botox treatment is not the same among all providers. Botox is not an ordinary commodity such as wheat or sugar or flour. Botox is a medical procedure that requires nuance, experience and expertise. All Botox providers are not equal in education or skill and some are actually quite poor. Most Botox providers charge either by the amount of Botox used or by the region of the face treated. I feel that charging by the amount of Botox used is the most equitable.
Spread of toxin effects. The effect of botulinum toxin may affect areas away from the injection site and cause serious symptoms including: loss of strength and all-over muscle weakness, double vision, blurred vision and drooping eyelids, hoarseness or change or loss of voice, trouble saying words clearly, loss of bladder control, trouble breathing, and trouble swallowing.
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