Pamidronic acid is a medication commonly prescribed for the treatment of bone diseases such as osteoporosis. This medication is also referred to as pamidronate, aminohydroxypropylidene bisphosphonate, and APD. Other synonyms for this drug include Biphosphonate, Fosamax, and Zoledronic Acid. Pamidronic acid is a powerful drug that is commonly administered intravenously over several hours. It works by inhibiting the breakdown of bone tissue, thereby increasing bone density. This medication is generally well tolerated, but like any medication, it can have side effects. If you are prescribed pamidronic acid, it is important to follow your doctor's instructions carefully to ensure that you receive the maximum benefit from the medication.