[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Pharmacology](https://durgical.com/en/pharmacology/) › [Bisphosphonates](https://durgical.com/en/pharmacology/classes/bisphosphonates/) › Pamidronic acid

# Pamidronic acid

## Bisphosphonates?

Bisphosphonates

An intravenous bisphosphonate. It lowers high calcium from cancer and protects bone in myeloma, bone metastases and Paget's disease.

Updated Nov 1, 2026

Also called: Pamidronate

## Quick facts

**Group**
[Bisphosphonates](https://durgical.com/en/pharmacology/classes/bisphosphonates/)

**Target**
Farnesyl pyrophosphate synthase (FPPS) in osteoclasts

**Used for**
Hypercalcaemia of malignancy · Paget's disease of bone

**Key effects**
Redness · Nausea · Bone

**Monitor**
Serum calcium · Kidney function · Dental health

**ATC**
M05BA03

No doses: the clinician sets them by the current guideline.

On this page

- The basics Mechanism of action
- Indications
- Adverse effects
- Pharmacokinetics
- Memory aid

- Safety Contraindications
- Key interactions
- What is monitored
- Administration and safety
- Pregnancy and breastfeeding
- Nursing care

- Study Test yourself

- Connections Connections

## Mechanism of action

✂**Farnesyl pyrophosphate synthase (FPPS) in osteoclasts**Pamidronic acid

ⓘ The figure shows pamidronate itself in the active site of human farnesyl pyrophosphate synthase (crystal structure).

**Target in 3D:** Farnesyl pyrophosphate synthase (FPPS) in osteoclasts. PDB structure 2F89 (RCSB PDB, public domain). [View the structure at RCSB PDB](https://www.rcsb.org/structure/2F89) · Drag to rotate · pinch to zoom

Pamidronic acid binds bone mineral and is taken up by resorbing osteoclasts, where it inhibits farnesyl pyrophosphate synthase. Osteoclasts stop resorbing bone, so less calcium is released into the blood and bone destruction by tumours or Paget's disease slows.

- Pamidronate binds bone at sites of high turnover
- Osteoclasts take it up and FPPS is inhibited
- Bone resorption falls
- Less calcium leaves bone; serum calcium falls

## Indications

- Hypercalcaemia of malignancy [Hypercalcaemia of malignancy →](https://durgical.com/en/conditions/hypercalcaemia-of-malignancy/)
- Bone lesions of multiple myeloma, with chemotherapy [Multiple myeloma →](https://durgical.com/en/conditions/multiple-myeloma/)
- Bone metastases of breast cancer, with chemotherapy [Breast cancer →](https://durgical.com/en/conditions/breast-cancer/)
- Paget's disease of bone [Paget disease of bone →](https://durgical.com/en/conditions/paget-disease-of-bone/)

## Adverse effects

### Common

- Fever and flu-like symptoms after the first infusion, which usually do not recur
- Redness, swelling or pain at the infusion site
- Nausea, vomiting, abdominal pain, constipation or diarrhoea
- Bone, muscle or joint pain
- Headache, tiredness and swelling of the legs

### Serious (rare, important)

- Osteonecrosis of the jaw
- Hypocalcaemia (muscle spasm, tingling around the mouth)
- Eye inflammation (eye pain or tearing)
- Severe bone, muscle or joint pain

## Contraindications

- Hypersensitivity to pamidronate or other bisphosphonates
- Caution: kidney disease

## Key interactions

**Calcium and vitamin D supplements**
Often recommended alongside to prevent low calcium

**Chemotherapy for myeloma or breast cancer**
Given together for bone protection

## What is monitored

- Serum calcium, phosphate and magnesium
- Kidney function (creatinine) before each dose
- Dental health
- Temperature after the first infusion

## Administration and safety

- Intravenous only, as a slow infusion over hours, never as a rapid injection
- Faster or more concentrated infusions cause more reactions
- Kidney function is checked before each dose
- A dental examination comes before starting when possible

## Pregnancy and breastfeeding

It may stay in the body for years and could affect a fetus; reliable contraception is used and the prescriber is told about pregnancy plans.

## Nursing care

- Check creatinine and calcium before the infusion
- Warn about fever and aches after the first infusion
- Inspect the infusion site
- Teach the signs of low calcium and of jaw problems
- Advise reliable contraception in people who could become pregnant

## Pharmacokinetics

**Absorption**
Given only intravenously, as a slow infusion over several hours

**Distribution**
Binds bone and can stay in the body for years

## Memory aid

PAMIdronate is the PAtient's IV for Malignancy, myeloma and Paget's: slow drip, flu-like first time.

## Test yourself

Think of the answer, then tap the question to see it.

## How does pamidronate lower calcium in hypercalcaemia of malignancy?

It inhibits osteoclast bone resorption, so less calcium is released from bone.

## What reaction is typical after the first pamidronate infusion?

A short-lived acute-phase reaction: fever, flu-like symptoms and muscle or joint aches.

## Which laboratory value is checked before each pamidronate infusion for safety?

Kidney function (serum creatinine), together with calcium.

[Add to my cards (3)](https://durgical.app/estudiar/?add=/en/pharmacology/pamidronic-acid/)

[More Pharmacology questions →](https://durgical.com/en/practice/?f=pharmacology)

## Connections

## Related drugs 4

- [Zoledronic acid](https://durgical.com/en/pharmacology/zoledronic-acid/)
- [Ibandronic acid](https://durgical.com/en/pharmacology/ibandronic-acid/)
- [Alendronic acid (alendronate)](https://durgical.com/en/pharmacology/alendronic-acid/)
- [Denosumab](https://durgical.com/en/pharmacology/denosumab/)

## Related conditions 4

- [Hypercalcaemia of malignancy](https://durgical.com/en/conditions/hypercalcaemia-of-malignancy/)
- [Multiple myeloma](https://durgical.com/en/conditions/multiple-myeloma/)
- [Breast cancer](https://durgical.com/en/conditions/breast-cancer/)
- [Paget disease of bone](https://durgical.com/en/conditions/paget-disease-of-bone/)

[← Back to the class: Bisphosphonates](https://durgical.com/en/pharmacology/classes/bisphosphonates/)

Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: [Pamidronate Injection: MedlinePlus Drug Information](https://medlineplus.gov/druginfo/meds/a601163.html) (MedlinePlus (U.S. National Library of Medicine), 2026); [ATCDDD - ATC/DDD Index](https://atcddd.fhi.no/atc_ddd_index/?code=M05BA03) (WHO Collaborating Centre for Drug Statistics Methodology, 2026).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/pharmacology/pamidronic-acid/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/pharmacology/pamidronic-acid/