Present invention discloses a dispenser having means to dispense desired number of pills from a bulk supply of pills contained in the dispenser. The dispenser comprises of storage compartment having bulk supply of pills and having a discharge port emptying into counting compartment. The counting compartment contains first and second conveyors moving at first and second speed; wherein the second speed is greater than the first speed thereby enabling pill separation; the second conveyor discharges pills into dispensing compartment. Sensors are strategically placed along the conveyors to count pills discharged into dispensing compartment. A pill recovery system and apparatus is disposed inside the dispenser having means to recover pills remaining on conveyors upon completion of a dispensation cycle and deposit recovered pills back into the storage compartment for use in future dispensation cycles. A docking station having receptacles to accommodate dispenser is provided. Docking station has communication ports enabling two-way communication with personal computer. The present invention also relates to a method of determining medication-medication interaction. Furthermore, the present invention relates to a method of determining medication side effect as being causative of a patient's clinical symptoms.