Defines an extra dose point
nameDose point name
typeCharacter; Options are "Bolus" or "Infusion"
amountOptional; Character specifying corresponding column in data or numeric specifying dose amount
rateOptional; Character specifying corresponding column in data or numeric specifying dose rate
deltaTimeOptional; Character specifying corresponding column in data or numeric specifying delta time
isSecondDoseUse second dose point on compartment?
dataOptional data frame. Must specify data if supplying column as character value to amount, rate, deltaTime arguments