Forteo (teriparatide) is a prescription drug used to treat osteoporosis in certain adults. Its cost may depend on factors like your dosage, health insurance, and the pharmacy you use. You'll also need to buy needles for injecting Forteo, which are not included with the drug. If you have insurance, prior authorization may be needed. Forteo also has a generic version, teriparatide, which is usually cheaper. For long-term use, consider getting a 90-day supply or using a mail-order pharmacy to reduce costs. If you need help covering the cost or understanding insurance, consult your doctor or pharmacist.