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Shall we talk about the Dexamethasone injection?

MBBS
Medically Reviewed by MBBS ✓ Medically Reviewed
📅 Updated: Jul 14, 2026 • ⏱ 7 min read • Editorial policy
Shall we talk about the Dexamethasone injection?
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Sometimes when you have a severe joint pain, a sudden worsening of asthma, or a severe allergy, the doctor prescribes an injection, right? A very common and very important drug that is given at such times is dexamethasone. Although this is a very useful drug, it is very important to be properly informed about it. So, let's talk about this in a little more detail today.

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What is Dexamethasone?

Simply put, dexamethasone is an injection that belongs to a class of drugs called corticosteroids . Its main function is to reduce inflammation in the body, which means swelling, redness, and pain. That's why doctors use this drug as a treatment for many diseases.

Here are some of the most common uses of this medicine:

  • Control inflammatory conditions in the skin, joints, lungs, and other organs of the body.
  • When asthma is aggravated.
  • Control severe allergies .
  • For joint diseases like arthritis .
  • For some blood disorders.
  • For diseases of the adrenal glands.

Your doctor may also prescribe this medication for other conditions not on this list.

Things you need to tell your doctor before taking medicine

Before you are given dexamethasone injection, it is important to give your doctor a complete description of your health. Be sure to tell them if you have any of the following diseases or conditions:

  • Current infections: If you have any infectious conditions such as chickenpox, measles, herpes, or tuberculosis.
  • Diabetes Mellitus: This medicine can increase blood sugar levels.
  • High Blood Pressure or Heart Disease: If you have heart disease or have had a heart attack in the past.
  • Kidney or liver disease: If you have problems with kidney or liver function.
  • Stomach or intestinal problems: Conditions like stomach ulcers.
  • Mental health problems: If you have mental illnesses such as depression.
  • Other medical conditions: Glaucoma, osteoporosis (thinning of the bones), myasthenia gravis (muscle weakness), seizures, or thyroid problems.
  • Allergies:If you are allergic to dexamethasone or other corticosteroids, or to lactose (milk sugar), any other medicine, or any food.
  • Pregnancy or breastfeeding: If you are pregnant, trying to get pregnant, or are a breastfeeding mother.

Providing this information accurately will make it easier for the doctor to treat you safely.

How do you take this medicine?

Dexamethasone is an injection that is usually given by a healthcare professional (doctor or nurse) in a hospital or clinic. It is not a medicine that you can take home and inject.

Depending on the condition, this injection can be given in one of the following ways:

  • into a muscle
  • Into a vein
  • Into a joint
  • Into a lesion

Important: Special care is required when giving this medicine to children. Therefore, if this medicine is prescribed for your child, discuss it carefully with your pediatrician.

What if I take too much medicine?

This is given under medical supervision, so the chances of this happening are very low. However, if you suspect an overdose or experience severe allergic symptoms, immediately call the National Poisons Information Centre at the Colombo National Hospital or go to the Emergency Department (ETU) of the nearest hospital.

Other medications that may interact with this medicine

It is very important to tell your doctor if you are taking other medications, as some medications can interact with dexamethasone and cause side effects or change how the medication works.

Type of medicine Description and examples
What should never be taken Live virus vaccines
PainkillersAspirin and other NSAID painkillers (e.g. Ibuprofen, Naproxen)
Diabetes medicine Insulin and other diabetes pills
Blood thinners Warfarin
Medicines for epilepsy Carbamazepine, Phenobarbital, Phenytoin
Antibiotics and antifungals Erythromycin, Ketoconazole, Rifampin
Other Digoxin, Diuretics, Birth Control Pills, Thalidomide

This list is not complete, so tell your doctor about all medications, vitamins, and herbal products you are taking.

Things to be careful about while taking the medicine

Your immune system may be somewhat weakened while taking this medicine, so take special care to protect yourself from infections.

  • Protect yourself from infections: Seek medical advice immediately if you develop symptoms such as fever, cold, or sore throat. Try to stay away from people who are sick.
  • Take care of your blood sugar levels: If you are diabetic, check your blood sugar levels regularly. Ask your doctor if you need to make changes to your diet or diabetes medication dosage, if necessary.
  • Diet: If your doctor tells you to reduce salt in your diet, follow those instructions.
  • Surgery: If you are going to have any surgery or dental surgery in the future, tell your doctor or surgeon that you have taken dexamethasone within the past 12 months.
  • Medical ID: If you are on long-term steroid treatment, it is important to wear a medical card or bracelet stating that.

Possible side effects of the medicine

Like any medicine, dexamethasone can cause side effects in some people. Some of these can be serious and some can be mild.

Classification of side effects
Side effects that should be reported to your doctor immediately
Severe allergies Skin rash, itching, swelling of the face, lips or tongue.
Stomach problems Blood in the stool or black tarry stools, severe stomach pain.
Mental changes Restlessness, agitation, severe anxiety, hallucinations.
Symptoms of high blood sugar More thirst than usual, hunger, frequent urination, extreme fatigue, blurred vision.
Other serious symptoms Vision changes, eye pain, muscle weakness, ankle or foot swelling, wounds that don't heal, unusual bruising.
Side effects that are usually not serious (but should be reported to the doctor if they persist)
  • Increased appetite and weight gain
  • Headache
  • Nausea, vomiting
  • Trouble sleeping
  • Acne, thinning of the skin
  • Increased hair growth on the face or body
  • Pain or redness where the injection was given

💡 Take-Home Message

  • Dexamethasone is a powerful corticosteroid drug used to control inflammation and allergies in the body.
  • Before starting this treatment, it is imperative that you inform your doctor about all medical conditions you have and all other medications you are taking.
  • As your immune system may be weakened while taking this medicine, take special care to protect yourself from infections. Seek medical advice immediately if you develop flu-like symptoms.
  • As this medication may affect blood sugar levels and blood pressure, monitor them regularly as directed by your doctor.
  • Never stop long-term steroid treatment suddenly without medical advice.
❓ FAQ

FAQ

Evidence-based clinical answers to common patient questions

What if I take too much medicine?

This is given under medical supervision, so the chances of this happening are very low. However, if you suspect an overdose or experience severe allergic symptoms, immediately call the National Poisons Information Centre at the Colombo National Hospital or go to the Emergency Department (ETU) of the nearest hospital.

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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.