Common Neck pain, Drooping eyelids, Blurred vision, Diarrhoea, Double vision, Difficulty in swallowing, Shortness of breath, Eyelid swelling, Fatigue, Headache, Inability to control urination, Muscle stiffness, Muscle weakness, Muscle pain, Weakness, Limb pain, Fever, Injection site bruise, Injection site bleeding.

Expert advice for Botox Injection
• Inform the doctor if you have any history of bronchitis, pneumonia or problems with breathing, allergy to botulinum toxin, bleeding disorder, difficulty in swallowing, and muscle weakness at site of injection.
• Tell your doctor if you had any eye surgeries or have any other eye problems such as glaucoma (increase in pressure inside the eye which causes visual problems) or if you are being treated for blepharospasm (involuntary tight closure of the eyelids).
• Do not drive or operate machinery after taking botulinum toxin as it may cause muscle weakness or problem with vision.
• Tell your doctor if you are pregnant, planning to become pregnant or are breastfeeding. 
• Should not be given to patients allergic to botulinum toxin or to any of its ingredients.
• Should not be given to patients with generalized disorders of muscle activity such as myasthenia gravis (abnormal weakness of certain muscles).
• Should not be given to patient with infection at the injection site.

Q. Botox an agonist or antagonist?
No it is neither an agonist nor antagonist. Botox is a neurotoxin produced by the bacterium Clostridium botulinum. It acts by blocking the activity of chemical (acetylcholine) in the brain

Q. Is Botox dangerous?
Yes, Botox causes neurotoxicity

Q. How does Botox cause paralysis?
Botox interferes with neural transmission by blocking the release of a chemical acetylcholine, the principal neurotransmitter at the neuromuscular junction, causing muscle paralysis.