Andrew M. Blumenfeld is director of The Headache Center of Southern California. Most of his research has focused on the use of OnabotulinumtoxinA in the treatment of chronic migraine. He helped develop the injection paradigm approved by the United States Food and Drug Administration and has taught providers around the world on practical aspects of this treatment option.

Other side effects of BOTOX® and BOTOX® Cosmetic include: dry mouth, discomfort or pain at injection site, tiredness, headache, neck pain, eye problems: double vision, blurred vision, decreased eyesight, drooping eyelids, swelling of eyelids, dry eyes, and drooping eyebrows. In people being treated for urinary incontinence other side effects include: urinary tract infection, painful urination, and/or inability to empty your bladder on your own. If you have difficulty fully emptying your bladder after receiving BOTOX®, you may need to use disposable self-catheters to empty your bladder up to a few times each day until your bladder is able to start emptying again.
These injection sites have been carefully chosen to treat specific nerve endings that are sending pain signals. BOTOX for migraines has proven to be a highly-effective treatment for people who are living with the painful, debilitating symptoms of chronic migraines. BOTOX will be carefully and correctly injected into muscles just beneath the skin. The procedure is not particularly painful, with a sensation of pinpricks.
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Remember that the skill of the injector is extremely important when considering Botox injections. Because Botox can have some very obvious and embarrassing side effects like drooping eyelids, blurry vision, and excessive bruising around the injection site, it's important to consult with an experienced injector. Unlike dermal fillers which can be melted away with a follow-up injection of hyaluronidase, there's not much you can do about a bad Botox experience other than wait it out.
Deaths as a complication of severe dysphagia have been reported after treatment with botulinum toxin. Dysphagia may persist f or several months, and require use of a feeding tube to maintain adequate nutrition and hydration. Aspiration may result from severe dysphagia and is a particular risk when treating patients in whom swallowing or respiratory function is already compromised.

Treatment with botulinum toxins may weaken neck muscles that serve as accessory muscles of ventilation. This may result in a critical loss of breathing capacity in patients with respiratory disorders who may have become dependent upon these accessory muscles. There have been postmarketing reports of serious breathing difficulties, including respiratory failure.
Serious and/or immediate hypersensitivity reactions have been reported. These reactions include anaphylaxis, serum sickness, urticaria, soft-tissue edema, and dyspnea. If such a reaction occurs, further injection of BOTOX® should be discontinued and appropriate medical therapy immediately instituted. One fatal case of anaphylaxis has been reported in which lidocaine was used as the diluent, and consequently the causal agent cannot be reliably determined.
With abnormal joint movement and inactivity, muscles can shorten and contract. In the case of muscle spasticity, the joint and soft tissue can be normal, but with constant contraction of a muscle because of spasticity the muscle can shorten. When it can no longer stretch to allow full range of motion, a contracture can happen. Agents that lessen the spasticity of the involved muscles best prevent this type of contracture.
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In order to minimize the chance of developing a bruise, the key thing to prep for your injections should be to stop all blood thinners (like aspirin, Advil, Motrin, fish oil ,omega 3  vitamin E and other product) prior to making an appointment for an injection. Staying off blood thinners for at least one week is ideal but chilling the skin prior to treatment will reduce the chances of a bruise.
BOTOX® treats the symptoms of severe underarm sweating when topical medicines do not work well enough in people 18 years and older. It is not known whether BOTOX® is safe or effective for severe sweating anywhere other than your armpits. BOTOX® treatments temporarily block the chemical signals from the nerves that stimulate the sweat glands, resulting in reduced sweating.
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