How do you take Zoledronic acid?

This is not a tablet, it is given as a slow drip into your vein by a doctor or nurse in a hospital or clinic. For osteoporosis, you usually get one 5mg infusion once a year. For cancer-related bone problems, the usual dose is 4mg given as a 15-minute drip every 3 to 4 weeks. You must drink plenty of water before and after the infusion to protect your kidneys.

What are the side effects of Zoledronic acid?

Fever and body aches for 1-3 days after the infusion (very common, like a mild flu), joint or muscle pain, headache, tiredness, nausea or loss of appetite

Who should not take Zoledronic acid?

People allergic to zoledronic acid or other bisphosphonates, people with severe kidney problems, pregnant or breastfeeding women, people with very low calcium levels in their blood, and anyone with untreated dental problems or planned jaw surgery should inform their doctor before receiving this drug.

Prescription

Bisphosphonate (bone-strengthening medicine)

Zoledronic acid

Last reviewed July 2026

Who is this for?

For adults (18+). Standard adult dosing applies: see the How to Take tab for full instructions.

What is this drug?

Zoledronic acid is a strong bone-strengthening medicine given as a drip (infusion) into your vein. It works by slowing down the breakdown of bone, helping your bones stay strong and reducing calcium levels in the blood when they are too high.

How it works

Inhibits osteoclast-mediated bone resorption by binding to hydroxyapatite crystals in the bone matrix and blocking the mevalonate pathway, thereby reducing farnesyl pyrophosphate and geranylgeranyl pyrophosphate synthesis essential for osteoclast function and survival.

What is it used for?

Weak and brittle bones (osteoporosis), high calcium in the blood caused by cancer, bone damage from cancer that has spread to the bones, Paget's disease of bone

Prescription Required

You need a doctor's prescription to buy this drug.

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What to watch out for

This drug must only be given in a hospital or clinic by trained healthcare workers, never buy it from roadside sellers or try to self-administer. Make sure to visit your dentist before starting treatment, as this drug can affect your jaw bone. Drink plenty of water on the day of your infusion and take any calcium and vitamin D supplements your doctor prescribes to prevent complications.

Common Side Effects

Fever and body aches for 1-3 days after the infusion (very common, like a mild flu)
joint or muscle pain
headache
tiredness
nausea or loss of appetite

Serious Side Effects

Severe jaw pain or swelling (a rare but serious condition called jaw bone damage: tell your doctor immediately if you notice this)
signs of kidney problems such as passing very little urine or swelling in your legs
very low calcium levels causing numbness or tingling around your mouth or muscle spasms.

Drug Interactions

Avoid using other drugs that can harm your kidneys at the same time, such as some strong painkillers (e.g. ibuprofen, diclofenac) and certain antibiotics like gentamicin, and always tell your doctor what you are taking. If you are on other calcium-lowering medicines, your calcium could drop dangerously low. Let your doctor know about all supplements and herbal medicines you use.

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Pregnancy & Breastfeeding Warning

Zoledronic acid is NOT safe during pregnancy or breastfeeding, as it can seriously harm the unborn baby and may pass into breast milk.

Who Should NOT Take This

People allergic to zoledronic acid or other bisphosphonates
people with severe kidney problems
pregnant or breastfeeding women
people with very low calcium levels in their blood
and anyone with untreated dental problems or planned jaw surgery should inform their doctor before receiving this drug.

How to Store

This medicine is stored and handled in hospitals and pharmacies. It should be kept below 30°C, away from direct sunlight and heat. If you are given any portion to transport, keep it cool and away from children at all times.

For information only: not medical advice. Always talk to a doctor or pharmacist before changing your medication.