A method for administering a medicament suitable for treating a migraine or cluster headache to a patient in need thereof includes placing a mounting surface of a fluid delivery apparatus with the medicament in contact with at least a portion of the skin of said patient. A flow rate of the medicament from the fluid delivery apparatus is adjusted such that the medicament is delivered to the patient for at least a predetermined time period. The fluid delivery apparatus includes a controller assembly having a body component defining an axis and a plunger component slidably coupled to the body component. The plunger is positionable between a first position in which the plunger is nearest to the body component and a second position in which the plunger component is furthest from the body component. A bias assembly is positioned between the body component and the plunger component. The bias assembly is configured to apply a two stage force profile to the plunger component. Also disclosed is a method for administering sumatriptan to a patient in need thereof such that the Cmax, Tmax and AUC are within predetermined, therapeutically effective values.
