betamethasone sodium phosphate at a glance
Medicine class
Glucocorticoid corticosteroid
Available forms
Soluble tablets, solution for injection, and eye, ear or nasal drops
What is betamethasone sodium phosphate used for?
Licensed uses depend on the formulation and clinical setting.
Soluble tablets treat systemic inflammatory and immune-mediated disorders.
Injection is used for selected severe or local conditions, including severe asthma, acute allergic reactions alongside appropriate emergency treatment, severe shock, acute adrenal crisis and selected soft-tissue inflammation.
Eye, ear and nose drops treat steroid-responsive inflammation where infection has been excluded.
The injection supplements rather than replaces established treatment for anaphylaxis, severe asthma or shock.
How does betamethasone sodium phosphate work?
It binds to glucocorticoid receptors and changes gene activity, reducing inflammatory and immune mediators. This decreases inflammation but can weaken infection defences and suppress natural corticosteroid production during sufficient systemic exposure.
betamethasone sodium phosphate preparations and strengths
Tablet
Route: Oral
Strengths: 500 micrograms
Injection
Route: Parenteral
Strengths: 4 mg/mL
How to take betamethasone sodium phosphate
Follow the formulation-specific instructions from the prescriber, pharmacist and product leaflet.
Soluble tablets may be dissolved in water and taken immediately, or swallowed whole.
Eye, ear and nose drops are for local use only. Wash your hands and avoid touching the nozzle to any surface.
Remove soft contact lenses before preserved eye drops and do not drive until blurred vision clears.
Injection is administered by a healthcare professional using a route appropriate to the condition.
betamethasone sodium phosphate side effects
Common or expected effects
- Mood, sleep, thinking or behavioural changes with systemic treatment
- Temporary burning, stinging, itching or irritation from drops
- Nasal irritation or dryness
Get urgent medical advice
- Severe allergic reaction
- Severe depression, suicidal thoughts, mania, hallucinations or marked confusion
- Serious or unusually severe infection, which may have muted symptoms
- Eye pain, worsening vision, glaucoma, corneal injury or cataract
- Adrenal insufficiency after abrupt withdrawal or substantial systemic exposure
- Gastrointestinal ulceration or bleeding, pancreatitis, tendon rupture, severe muscle weakness or serious skin reaction
betamethasone sodium phosphate in pregnancy
Systemic treatment may be used when a clinician considers the benefits greater than the risks. Some studies suggest possible associations with cleft lip or palate, restricted fetal growth or preterm birth, but most exposed babies are unaffected and the underlying illness may contribute. Do not stop systemic treatment suddenly; discuss pregnancy or planned pregnancy with the prescriber. Local drops should be used only when recommended.
betamethasone sodium phosphate while breastfeeding
betamethasone sodium phosphate interactions
Interaction risk is greatest with systemic treatment, although prolonged local treatment can also produce systemic exposure.
Rifampicin, rifabutin and enzyme-inducing antiseizure medicines
May accelerate corticosteroid metabolism and reduce its effect.
Ritonavir, cobicistat and other strong CYP3A inhibitors
May increase systemic exposure and the risk of adrenal suppression or Cushing-like effects.
Common questions about betamethasone sodium phosphate
Answers are fully visible for fast scanning and source review.
Is it a steroid?
Yes. It is a glucocorticoid corticosteroid, not an anabolic steroid.
Is it an antibiotic?
No. It does not kill bacteria, viruses or fungi and can mask or worsen infection.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.