A method for administering a medicament to a patient includes placing a fluid delivery apparatus with the medicament in contact with 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 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.