This offer is valid only for patients 18 years of age or older and is good for use only with a valid prescription for LINZESS ® (linaclotide) capsules 72 mcg, 145 mcg, or 290 mcg at the time the prescription is filled by the pharmacist and dispensed to the patient.; This offer is not valid for use by patients enrolled in Medicare, Medicaid, or other federal or state programs (including any ....