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The following adverse reactions have been identified during post-approval use of BOTOX. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. These reactions include: abdominal pain; alopecia , including madarosis; anorexia ; brachial plexopathy; denervation /muscle atrophy ; diarrhea; hyperhidrosis; hypoacusis; hypoaesthesia; malaise ; paresthesia ; peripheral neuropathy ; radiculopathy ; erythema multiforme , dermatitis psoriasiform, and psoriasiform eruption; strabismus; tinnitus ; and visual disturbances.