Osteogenesis Imperfecta Medication
- Author: Manoj Ramachandran, MBBS, MRCS, FRCS; Chief Editor: Harris Gellman, MD more...
Medication Summary
The goals of pharmacotherapy are to reduce morbidity and prevent complications.[21]
Bisphosphonates
Class Summary
Bisphosphonates are the only drugs specifically licensed for the treatment of osteogenesis imperfecta (OI). The most commonly used drug in this class is pamidronate.[24, 25, 22]
Bisphosphonates are analogues of inorganic pyrophosphate and act by binding to hydroxyapatite in bone matrix, thereby inhibiting the dissolution of crystals. They prevent osteoclast attachment to the bone matrix and osteoclast recruitment and viability.
For maximum gut absorption, all oral bisphosphonates should be taken at least 2 hours before or after meals. The newer bisphosphonates are not completely free of the risk of causing a mineralization defect, but their safe therapeutic window is much wider. They clearly are more potent than etidronate in reducing disease activity and normalizing alkaline phosphatase levels
Pamidronate (Aredia, APD)
Pamidronate is a potent second-generation bisphosphonate that acts principally by inhibiting osteoclastic bone resorption. Cyclic intravenous (IV) pamidronate is given in a dose of 7.5 mg/kg/y at 4- to 6-month intervals.
Alendronate (Fosamax)
Alendronate is a potent third-generation bisphosphonate that principally acts by inhibiting osteoclastic bone resorption.
Risedronate (Actonel, Atelvia)
Risedronate is a potent aminobisphosphonate that principally acts by inhibiting osteoclastic bone resorption.
Tiludronate (Skelid)
Tiludronate is a sulfur-containing bisphosphonate of intermediate potency between etidronate and newer nitrogen-containing bisphosphonates. No food, indomethacin, or calcium should be ingested within 2 hours before and 2 hours after administration. A 3-month posttreatment evaluation follows.
Zoledronate (Reclast, Zometa)
Zoledronate inhibits bone resorption. It inhibits osteoclastic activity and induces osteoclastic apoptosis.
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| Type | Genetic | Teeth | Bone Fragility | Bone Deformity | Sclera | Spine | Skull | Prognosis |
| IA | AD* | Normal | Variable but less severe than other types | Moderate | Blue | 20% scoliosis and kyphosis | Wormian bones | Fair |
| IB | AD | Dentinogenesis imperfecta | NA | NA | NA | NA | NA | NA |
| II | AD | Unknown | Very severe | Multiple fractures | Blue | NA | Wormian bones with absence of ossification | Perinatal death |
| III | AD | Dentinogenesis imperfecta | Severe | Progressive bowing of long bones and spine | Bluish at birth but white in adults | Kyphoscoliosis | Hypoplastic wormian bones | Wheelchair-bound, not ambulatory |
| IVA | AD | Normal | Moderate | Moderate | White | Kyphoscoliosis | Hypoplastic wormian bones | Fair |
| IVB | AD | Dentinogenesis imperfecta | NA | NA | NA | NA | NA | NA |
| * AD = autosomal dominant; NA = not applicable. | ||||||||

