Drilldown: Medicines

None (1)

Botox (1)

neuromuscular blocker (presynaptic) (1) · Neurotoxin (1)

Cleaves SNAP-25 protein in presynaptic motor and autonomic nerve terminals, blocking acetylcholine release; in chronic migraine, hypothesized to inhibit peripheral sensitization of trigeminovascular nociceptors (1)

Chronic migraine (≥15 headache days/month), cervical dystonia, blepharospasm, hyperhidrosis, overactive bladder, urinary incontinence, strabismus, spasticity, cosmetic problems (1)

Chronic migraine (PREEMPT protocol): 155 units divided across 31 sites in 7 head/neck muscle groups every 12 weeks (1)

50, 100, or 200 unit vials of lyophilized powder for reconstitution (1)

195 units/treatment for chronic migraine; max varies by problem (1)

Intramuscular (PREEMPT injections for migraine) (1)

None · Hours · 30-60 minutes · 1-2 hours · ~30 min · LDL lowering at 2 weeks, max by 4 weeks · ~1 hour · 15-30 minutes · 15–30 min · 1–2 h · 30–60 min · Antidepressant effect emerges over 1-2 weeks · BP and symptomatic LUTS improvement within 1-2 weeks · BP effect within 1-2 weeks · Clinical improvement within 24-72 hours · Days · Motor improvement over days at therapeutic dose · Over weeks · Postprandial glucose effect within days; HbA1c by 12 weeks · Sleep effect from first dose; antidepressant effect over 1-4 weeks

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None · 24 hours · 4-6 hours · 12 hours · 6-8 hours · Daily dosing · 8-12 hours · 12-24 hours · Hours · Hours per application · 24 hours (HS dosing) · 24 hours (once-daily dosing) · 24 h · N/A · N/A (replacement) · Variable · ~7-8 hours · 3-5 hours · 4-6 hours (IR); 24 hours (ER) · 6-12 hours

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Tissue half-life not formally measured; clinical effect ~12 weeks (1)

Local (intramuscular) (1)

Category C; limited data (1)

Rx; black-box warning for distant spread of toxin effect (1)