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Teriparatide

Teriparatide (Forsteo®) is a recombinant form of parathyroid hormone, used in the treatment of advanced osteoporosis. more...

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Administration

Teriparatide is administered by injection once a day in the thigh or abdomen. The recommended dose is 20 ╬╝g per day.

Uses

Teriparatide is a third-line agent in osteoporosis, after calcium/vitamin D supplementation and bisphosphonates. The bisphosphonates are effective in a large majority of osteoporosis patients, and only a minority would normally require teriparatide.

Mechanism of action

Teriparatide is the portion of human parathyroid hormone (PTH),amino acid sequence 1 through 34 of the complete molecule which contains amino acid sequence 1 to 84. Endogenous PTH is the primary regulator of calcium and phosphate metabolism in bone and kidney. Daily injections of teriparatide stimulate new bone formation leading to increased bone mineral density.

Teriparatide is the first FDA approved agent for the treatment of osteoporosis that stimulates new bone formation.

FDA approval

Forsteo was approved by the FDA on 26 November 2002, for the treatment of osteoporosis in postmenopausal women who are at high risk for having a fracture. The drug is also approved to increase bone mass in men with primary or hypogonadal osteoporosis who are at high risk for fracture.

Read more at Wikipedia.org


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Back pain is reduced for at least 30 months after stopping teriparatide
From OB/GYN News, 11/1/05 by Bruce Jancin

VIENNA -- The risk of developing new-onset back pain is markedly decreased during and for at least 30 months after stopping teriparatide (Forteo) for the treatment of osteoporosis, Jean-Yves Reginster, M.D., Ph.D., reported at the annual European congress of rheumatology.

He presented a metaanalysis of four Eli Lilly-sponsored randomized double-blind clinical trials involving 1,222 teriparatide-treated patients and 691 controls. The control groups in two of the trials received placebo. In the other two, controls got 10 mg/ day of alendronate or hormone therapy. The median follow-up after discontinuing teriparatide was more than 31 months.

The incidence of any new back pain during 4,157 patient-years at risk was 6.9 cases per 100 patient-years among subjects in the teriparatide-treated group, compared with 9.3 cases per 100 patient-years in controls. (See box.)

There was no significant difference in the incidence of new back pain in patients who received 20 mcg/day of subcutaneous teriparatide and in those who got 40 mcg/ day. Rates in teriparatide-treated patients and controls appeared to diverge after 6 months of therapy, noted Dr. Reginster, director and professor of epidemiology, public health, and health economics at the University of Liege, Belgium.

The relative risk of developing severe back pain during teriparatide therapy or for 30 months after treatment ended was reduced by 61%, compared with controls. The risk of developing moderate or severe back pain was reduced by 28%. And the risk of any new-onset back pain was 27% lower in the teriparatide group.

In a separate presentation, Thomas Nickelsen, M.D., said that postmenopausal osteoporotic women showed a significant decrease in self-as-sessed back pain after 1 and 6 months of teriparatide in the ongoing European Forteo Study (EUROFORS). At baseline, the women rated their back pain as scoring a mean of 50 points out of 100 on a visual analog scale. After 6 months of open-label teriparatide, their score dropped by a 10-point absolute margin, or 20%.

These back pain findings are incidental to the primary purpose of EUROFORS, which is to study the impact of sequential antiosteoporosis therapy--a year of teriparatide followed by a year of raloxifene--compared with 2 years of teriparatide, explained Dr. Nickelsen of Lilly Deutschland GmbH, Bad Homburg, Germany.

EUROFORS involves 866 severely osteoporotic postmenopausal women who fall into one of three subgroups: those with no history of antiresorptive therapy, those who'd been on antiresorptive therapy--primarily with bisphosphonates--prior to EUROFORS and responded adequately to it, and inadequate responders to prior antiresorptive agents. Women in all three groups receive a year of teriparatide. Those in the first two groups are then randomized to a year of raloxifene or a second year on teriparatide. For ethical reasons, all prior inadequate responders to antiresorptive therapy get 2 years of teriparatide.

The primary end point in EUROFORS will be the 2-year change in lumbar spine bone mineral density (BMD). After 6 months of teriparatide, mean lumbar spine BMD was up by 5.2% in the treatment-naive patients, 4.2% in prior adequate responders to antiresorptive therapy, and 3.7% in the inadequate responders. There was also a small but statistically significant increase in hip BMD in treatment-naive patients, no change in the adequate responders, and a small but significant decrease in the prior inadequate responders.

Side effects were similar to those seen in other teriparatide trials: nausea in 10% of patients, arthralgias in 5%, headache in 6%, pain in the extremities in 3%, and hypercalcemia in 2.1%.

BY BRUCE JANCIN

Denver Bureau

COPYRIGHT 2005 International Medical News Group
COPYRIGHT 2005 Gale Group

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