Drilldown: Medicines
Appearance
Medicines > generic:
Alfentanil
& onset
:
1–2 weeks for muscle effects; preventive migraine benefit accrues over 12-week cycles
or
Sleep effect from first dose; antidepressant effect over 1-4 weeks 
& onset
:
1–2 weeks for muscle effects; preventive migraine benefit accrues over 12-week cycles
or
Sleep effect from first dose; antidepressant effect over 1-4 weeks 
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