Prescriptions cannot be refunded. The prescription can be refilled if it is indicated by your doctor, for at least one year from the date of first use. After the year prescriptions have to be renewed. The prescriptions written in writing must contain the number of a veterinarian’s license as well as the number of their phone and address. Federal law limits the usage of Rx medications for use only by or upon the instruction of a licensed doctor.LEGEND4 mg and LEGEND(r)Multi-dose 20 mg are only approved for I.V. use. LEGEND2 is licensed for I.V. and I.A. use.