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Zoledronic acid and denosumab in myeloma | CION Cancer Clinics
The bone-strengthening injection for myeloma is usually zoledronic acid, a short drip, or denosumab, an injection under the skin. Both slow the bone damage myeloma causes and lower the chance of fractures. They do not treat the myeloma itself. A dental check comes first, kidney and calcium tests are repeated, and stopping denosumab needs a plan made with your team. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What is the bone-strengthening injection for myeloma?
- How do zoledronic acid and denosumab differ?
- What happens before and during treatment?
- Which side effects should you know about?
- What do families often get wrong about these injections?
- Who might not suit them, and what can this page not tell you?
- Common questions about zoledronic acid and denosumab
The short answer
What is the bone-strengthening injection for myeloma?
It is usually zoledronic acid, given as a short drip, or denosumab, given as an injection under the skin. Both slow down the bone damage myeloma causes, lowering the chance of fractures and bone pain.
How they work
Myeloma switches on the cells that dissolve bone. Zoledronic acid belongs to a group of medicines called bisphosphonates. It sticks to the bone surface and makes those cells less active. Denosumab is an antibody that blocks a signal the bone-dissolving cells need to form and work. The end result is similar: bone is broken down more slowly.
Who is usually offered one
Most people with active myeloma are offered a bone-strengthening medicine, whether or not scans show bone damage yet. It is given alongside the main myeloma treatment, not instead of it.
What they do not do
They do not treat the myeloma itself, and they do not fill in holes already made in the bone. They protect the bone that is left. Pain from an existing fracture may still need pain relief or radiotherapy.
Why the name on your prescription may differ
Pharmacies stock these medicines under several brand names, and older plans sometimes use pamidronate, another medicine from the same group as zoledronic acid. If the name on the bill does not match this page, ask the team which medicine it is. Keep a note of the name and the dates it was given.
This page gives no doses or schedules. Your haematologist decides which medicine suits you, how often, and for how long.Side by side
How do zoledronic acid and denosumab differ?
Zoledronic acid
Denosumab
A drip into a vein at the day-care unit
An injection under the skin, quick to give
Removed by the kidneys, so kidney tests are checked before each dose
Not removed by the kidneys, often chosen when they are weak
Flu-like aches can follow the first drip
Low calcium is a particular concern
Stays in the bone for a long time after stopping
Effect wears off after stopping, so stopping needs planning
Not sure whether this applies to you?
Ask an oncologistStep by step
What happens before and during treatment?
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A dental check first
Before the first dose, a dentist looks for infected teeth, loose teeth or gum disease. Any extractions are ideally done before starting, because the jaw heals less well once treatment begins.
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Blood tests
Kidney function, calcium and vitamin D are checked. If calcium or vitamin D is low, it is usually corrected before the first dose.
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Calcium and vitamin D supplements
Many people are prescribed these, especially with denosumab, to stop calcium dropping too low. Take them only as prescribed, because myeloma can also push calcium high.
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The dose itself
The drip or injection is given at regular intervals, often on the same day as other treatment, so it does not add many extra trips.
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Review over time
The team reviews how long to continue, based on how the myeloma responds, your kidneys and any side effects. Many people have a reduced schedule or a pause after a period of stable disease.
What to watch for
Which side effects should you know about?
Most people have few problems. These are the ones worth reporting early.
Flu-like aches
Fever, aching muscles and joints for a day or two, mostly after the first zoledronic acid drip. It usually settles on its own and is less likely with later doses.
Low calcium
Called hypocalcaemia on reports. Signs include tingling around the mouth or fingers and muscle cramps or twitching. Tell the team promptly.
Jaw bone problems
A rare but serious problem called osteonecrosis of the jaw, where an area of jawbone is exposed and does not heal.
Report
- Jaw pain, swelling or numbness
- A loose tooth or a sore that will not heal
- Exposed bone in the mouth
Kidney strain
Mainly with zoledronic acid. This is why kidney tests come before each dose, and why the dose may be adjusted or the medicine switched.
Unusual thigh pain
Very rarely, long-term use is linked to an unusual break in the thigh bone. New aching in the thigh or groin should be mentioned.
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Commonly believed
What do families often get wrong about these injections?
"The scans showed no bone damage, so she does not need it."
Many people with active myeloma are offered a bone-strengthening medicine even before damage shows up. It lowers the chance of future fractures while the myeloma is being brought under control.
"We can go to the dentist for an extraction whenever we like."
Always tell the dentist about these medicines first. Extractions and jaw surgery raise the chance of jaw bone problems. Routine cleaning and fillings are usually fine, and good mouth care lowers the risk.
"Denosumab can be stopped any time, since it is just an injection."
When denosumab stops, bone breakdown can speed up again quickly, with a risk of spine fractures. Stopping is planned by the team, often with another medicine to follow. Never let a dose lapse without speaking to them.
"Extra calcium tablets will make the injection work better."
Calcium is only helpful in the amount prescribed. Myeloma can cause dangerously high calcium, so extra tablets from a pharmacy can do harm. Take only what the team advises.
Did you know
The dental check before starting is part of the treatment plan, not an optional extra. Brushing twice a day, keeping dentures well fitted and seeing a dentist regularly all lower the chance of jaw bone problems.
Being straight with you
Who might not suit them, and what can this page not tell you?
These medicines suit most people with myeloma, but not everyone, and not always in the same way.
When zoledronic acid needs care
Badly damaged kidneys may mean a lower dose, a slower drip or a switch to denosumab. A dental problem needing extraction may delay the start.
When denosumab needs care
Low calcium or low vitamin D must be corrected first. It also needs a commitment to regular doses, because stopping without a plan can harm the bones.
What this page cannot tell you
It cannot tell you which medicine is right for you, how long you will need it, or whether your bones will avoid a fracture. It cannot weigh your kidney results, dental health and myeloma response together. Your haematologist does that.
How CION fits in
At CION, the haematology team plans bone protection alongside myeloma treatment and reviews it at a tumour board. Ask when your dental check should happen, which medicine is planned and why, and how kidney tests will be timed.
Questions we are asked
Common questions about zoledronic acid and denosumab
Is the zoledronic acid drip long?
The drip itself is short, usually well under an hour. It is given slowly on purpose, to protect the kidneys. It is often given on the same day as other myeloma treatment, so it may not add an extra trip. Drink the fluids your team suggests on that day.
Which one is better for my father?
Neither is better for everyone. Denosumab is often preferred when the kidneys are weak. Zoledronic acid lasts longer in the bone after stopping and needs fewer planning steps when a break is taken. His haematologist chooses based on his kidneys, calcium, dental health and treatment plan.
Can I get teeth cleaned or a filling during treatment?
Usually yes. Routine cleaning, fillings and denture adjustments are generally considered safe. Tell the dentist you are on a bone-strengthening medicine for myeloma. For extractions, implants or gum surgery, the dentist should speak to your haematology team first.
How long will these injections continue?
It varies. Many people have them regularly while the myeloma is active and for some time afterwards. The team may space them out or pause them once the disease is well controlled. If denosumab is paused, a planned follow-on medicine is often needed.
Why did I get a fever after the first drip?
Flu-like aches and a mild temperature for a day or two are a known reaction to the first zoledronic acid drip. It usually settles. Because myeloma treatment also raises infection risk, call the team if you have a fever, so they can decide whether it needs checking.
Are these the same as osteoporosis injections?
They are related medicines, but in myeloma they are given more often and for a different reason. If you already receive a bone medicine for osteoporosis, tell the haematology team, so the two plans can be combined safely rather than doubled.
What should I tell other doctors?
Tell every doctor and dentist you see that you are on zoledronic acid or denosumab for myeloma. Carry a list of medicines with dates. This matters most before dental work, any surgery, or if someone is planning to prescribe calcium or a new painkiller.
Are these medicines covered by schemes?
Coverage depends on the scheme and its current rules, which change. Aarogyasri, PM-JAY, CGHS, ECHS, EHS and cashless insurance may cover them as part of myeloma treatment. Bring your card and policy details and ask the team to check before treatment starts.
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Sources
- Cancer Research UK — Myeloma
- Macmillan Cancer Support — Myeloma
- NICE — Myeloma: diagnosis and management (NG35)
- National Cancer Institute — Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ), Patient Version
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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