An implantable pump for providing metered doses of a compound to an individual, said implantable pump comprising: a chamber for storing an individual dose of the compound; an inlet valve fluidly coupled to said chamber for controlling a flow of the compound into said chamber, wherein said inlet valve is an electrically actuated valve; an inlet valve driver circuit electrically coupled to said inlet valve and operable for opening and closing said inlet valve; an outlet valve fluidly coupled to said chamber for controlling a flow of the compound out of said chamber and into the individual, wherein said outlet valve is an electrically actuated valve; an outlet valve driver circuit electrically coupled to said outlet valve and operable for opening and closing said outlet valve; and a battery having a first voltage; and characterised by further comprising: a charging circuit comprising a capacitor and a voltage boost circuit, said charging circuit operatively coupled to said battery for charging of said capacitor to a second voltage greater than the first voltage, said capacitor, when charged, operable for supplying power to said inlet valve driver circuit and said outlet valve driver circuit; and an interlock circuit, wherein said interlock circuit is operable to prevent said inlet valve driver circuit from electrically actuating the inlet valve to open the inlet valve and said outlet valve driver circuit from electrically actuating the outlet valve to open the outlet valve during the same time interval; wherein neither said inlet valve driver circuit nor said outlet valve driver circuit is operable while said battery is charging said capacitor of said charging circuit; and wherein said charging circuit is not operable if one of said inlet valve driver circuit and said outlet valve driver circuit is operating. a chamber for storing an individual dose of the compound; an inlet valve fluidly coupled to said chamber for controlling a flow of the compound into said chamber, wherein said inlet valve is an electrically actuated valve; an inlet valve driver circuit electrically coupled to said inlet valve and operable for opening and closing said inlet valve; an outlet valve fluidly coupled to said chamber for controlling a flow of the compound out of said chamber and into the individual, wherein said outlet valve is an electrically actuated valve; an outlet valve driver circuit electrically coupled to said outlet valve and operable for opening and closing said outlet valve; and a battery having a first voltage; and characterised by further comprising: a charging circuit comprising a capacitor and a voltage boost circuit, said charging circuit operatively coupled to said battery for charging of said capacitor to a second voltage greater than the first voltage, said capacitor, when charged, operable for supplying power to said inlet valve driver circuit and said outlet valve driver circuit; and an interlock circuit, wherein said interlock circuit is operable to prevent said inlet valve driver circuit from electrically actuating the inlet valve to open the inlet valve and said outlet valve driver circuit from electrically actuating the outlet valve to open the outlet valve during the same time interval; wherein neither said inlet valve driver circuit nor said outlet valve driver circuit is operable while said battery is charging said capacitor of said charging circuit; and wherein said charging circuit is not operable if one of said inlet valve driver circuit and said outlet valve driver circuit is operating. a charging circuit comprising a capacitor and a voltage boost circuit, said charging circuit operatively coupled to said battery for charging of said capacitor to a second voltage greater than the first voltage, said capacitor, when charged, operable for supplying power to said inlet valve driver circuit and said outlet valve driver circuit; and an interlock circuit, wherein said interlock circuit is operable to prevent said inlet valve driver circuit from electrically actuating the inlet valve to open the inlet valve and said outlet valve driver circuit from electrically actuating the outlet valve to open the outlet valve during the same time interval; wherein neither said inlet valve driver circuit nor said outlet valve driver circuit is operable while said battery is charging said capacitor of said charging circuit; and wherein said charging circuit is not operable if one of said inlet valve driver circuit and said outlet valve driver circuit is operating.