An injection pen to deliver a predefined dose of substance according to a prescribed schedule is disclosed. The injection pen includes a first portion having a medicinal chamber and a removable cover. The medicinal chamber is coupled to a piston on one end and attachable to an injection needle on an opposite end. The removable cover includes a solution dispenser. The injection pen includes a second portion couplable to the first portion. The second portion includes an actuator coupled to the piston for actuating the piston in an injection. The actuator may be controlled by an electronic circuit board embedded within the injection pen to regulate the delivery of a substance in the medicinal chamber based on a prescribed dose and injection schedule.