What are some of the possible side effects of Botox?

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    There are many possible side effects of botox including droopy eyelids, blurred vision, and possible difficulty breathing. However, it is sometimes difficult to tell if the symptoms are from Botox itself or other factors. Here are the results from the FDA Double Blind study done with a placebo drug.

     

    Randomized Double Blind Studies1
    In a double blind study, 405 people aged 18 to 75 were administered Botox® Cosmetic and evaluated in randomized, placebo-controlled clinical studies.

    Adverse Event (in order of decreasing
    frequency for Botox® Cosmetic)
    Botox®
    N=405
    Placebo
    N=130
    Overall 177 (43.7%) 54 (41.5%)
    Body as a Whole
    Headache 54 (13.3%) 23 (17.7%)
    Pain in Face 9 (2.2%) 1 (0.8%)
    Flu Syndrome 8 (2.0%) 2 (1.5%)
    Pain at Injection Site 7 (1/7%) 1 (0.8%)
    Edema at Injection Site 6 (1.5%) 3 (2.3%)
    Pain in Back 4 (1.0%) 3 (2.3%)
    Injury Accidental 3 (0.7%) 1 (0.8%)
    Respiratory System
    Infection 14 (3.5%) 5 (3.8%)
    Bronchitis 6 (1.5%) 1 (0.8%)
    Sinusitus 6 (1.5%) 1 (0.8%)
    Pharyngitis 5 (1.2 %) 2 (1.5%)
    Dyspnea 3 (0.7%) 0 (0.0%)
    Infection Sinus 3 (0.7%) 2 (1.5%)
    Layrngitis 3 (0.7%) 0 (0.0%)
    Rhinitis 3 (0.7%) 2 (1.5%)
    Skin and Appendages
    Erythema 7 (1.7%) 2 (1.5%)
    Skin Tightness 4 (1.0%) 0 (0.0%)
    Irritation Skin 3 (0.7%) 0 (0.0%)
    Digestive System
    Nausea 12 (3.0%) 3 (2.3%)
    Dyspepsia 4 (1.0%) 0 (0.0%)
    Tooth Disorder 4 (1.0%) 0 (0.0%)
    Liver Function Abnormal 3 (0.7%) 2 (1.5%)
    Special Senses
    Blepharoptosis 13 (3.2%) 0 (0.0%)
    Nervous System
    Dizziness 5 (1.2%) 2 (1.5%)
    Paresthesia 4 (1.0%) 1 (0.8%)
    Anxiety 3 (0.7%) 0 (0.0%)
    Twitch 3 (0.7%) 0 (0.0%)
    Musculoskeletal System
    Muscle Weakness 8 (2.0%) 0 (0.0%)
    Urogenital System
    Infection Urinary Tract 4 (1.0%) 1 (0.8%)
    Hemic and Lymphatic System
    Ecchymosis 7 (1.7%) 3 (2.3%)
    Cardiovascular
    Hypertension 4 (1.0%) 0 (0.0%)
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