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Table 3 Adverse events

From: Prospective analysis of the use of OnabotulinumtoxinA (BOTOX) in the treatment of chronic migraine; real-life data in 254 patients from Hull, UK

Adverse event observed

Number of patients/254 (%)

Pain at the site of injection for at least 24 hours

38 (14.9)

Neck Stiffness

37 (14.56)

Ptosis

28 (11)

Reported but did not complain of inability to frown

15 (5.9)

Exacerbation of headache for five days

11 (4.3)

Difficulty in swallowing

5 (1.96)

Fainting during injection

3 (1.2)