Arbor Pharmaceuticals, the maker of Horizant, has a patient assistance program. If you're in the US you could be paying $55 a month (plus shipping) by applying to them directly. You can be on Medicare and still get this benefit. None of the cost is reimbursable by Medicare or any other insurance program. You can call 844-289-3981 for more info. Your doctor must submit the prescription directly to Truax Patients Services. Here are the steps listed on the website [arborpatientdirect.com/];
There are 2 easy steps: 1) You or your doctor sends your prescription to Truax Patient Services electronically, by mail, or via fax. 2) Your medications are delivered to your door. You can call 844-289-3981 to inquire about your prescription.
To submit a prescription, your doctor may choose one of the following options:
E-prescription
Truax Patient Services
Bemidji, MN 56601
NCPDP# 2431461
NPI# 1700149096
Surescripts# 169851
Fax
218-444-2267
Phone
844-289-3981
At $55 a month this is much more expensive than gabapentin, but if gabapentin stops working this is another option.