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What you need to know about Pentamidine injection

Dr. Priya Sammani (MBBS)
Medically Reviewed by Dr. Priya Sammani (MBBS) ✓ Medically Reviewed
📅 Updated: Jul 14, 2026 • ⏱ 7 min read • Editorial policy
What you need to know about Pentamidine injection
Table of Contents ▾

When your doctor tells you or someone in your family that you need to get an injection of a medicine called Pentamidine, it's normal to feel a little curious, and maybe even nervous. "What is this medicine?", "Why is it being given?", "What will happen with this?" come to mind. So today, let's talk in a very simple and friendly way about this medicine called Pentamidine, the reason it is given, the possible side effects, and the things we should be concerned about.

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Simply put, what is Pentamidine?

Pentamidine is a powerful drug that belongs to the anti-infective class. It is given as an injection. Its main use is to treat a type of pneumonia called Pneumocystis carinii pneumonia (we call it PCP for short).

Remember, PCP is not like pneumonia that comes after a common cold. It is a more serious lung infection that can occur, especially in people with weakened immune systems. So this is what a powerful drug like this is used to treat.

Doctors may sometimes prescribe this medicine for other conditions, so if you have any questions, ask your doctor about it.

Things you need to tell your doctor before starting medication

It is very important that your doctor is aware of your complete health status before deciding to prescribe this medication. You should especially tell them if you have any of the conditions listed below.

  • If you have diabetes .
  • If you have heart disease or problems with heart function.
  • If you have kidney disease .
  • If you have previously had a condition such as pancreatitis .
  • If you have an allergy to Pentamidine, any other medicine, food, dye, or preservative.
  • If you are pregnant , or expecting a baby soon.
  • If you are a breastfeeding mother.

Based on this information, the doctor will decide whether or not to give you this medicine, or with what precautions.

How is this medicine administered to the body?

This is not a medicine you can take home. Pentamidine injection is given in a hospital or clinic, under the supervision of trained medical staff. This is because it is a powerful medicine and any side effects need to be managed quickly.

There are two ways to administer the vaccine:

1.Intramuscular injection: Giving the vaccine into a muscle in the hip or arm.

2. Intravenous infusion: A substance, like saline, is slowly given into the body through a vein.

Do you give this to small children?

Yes, in some special cases, this medicine can be prescribed to children as young as 4 months old. But it should be done with great caution and under the close supervision of a pediatrician.

What if the medication dose increases?

Since this is given in a hospital setting, the risk of overdose or overdose is very low. If there is any suspicion of such a thing, the medical staff will take the necessary action immediately. If you have any concerns about this, it is important to immediately go to the ETU (Emergency Treatment Unit) or call the National Poisons Information Centre at the Colombo National Hospital .

Other drugs that may interact with this medicine (Drug Interactions)

Because Pentamidine is a powerful drug, it can interact with other medications you are taking. Therefore, it is important to tell your doctor about all the medications you are taking, including prescription medications, over-the-counter medications, traditional Ayurvedic medications, vitamins, and supplements. Below are some examples of medications that may interact with Pentamidine.

Drug category Medications that require special care (examples)
Medications that control heart rhythm Various types of medications given to people with irregular heartbeats.
Certain antibiotics Eg: clarithromycin, erythromycin, moxifloxacin, gentamicin, vancomycin.
Medication for mental illness Antidepressants (e.g. amitriptyline), and other medications for mental illness (e.g. haloperidol, chlorpromazine).
Diabetes medication Pentamidine can alter blood sugar levels, so great care should be taken when administering it with diabetes medications.
Other anti-infectives Antimalarial drugs (e.g. chloroquine), other antivirals (e.g. foscarnet, ganciclovir).
Some medications for cancer (Chemotherapy) Some anticancer drugs.

This list is not complete, so be sure to tell your doctor about all the medications you are taking.

Possible side effects and things to be aware of when taking the medicine

The medical staff will monitor your condition closely while you are taking this medicine. They will monitor whether your symptoms are getting better or worse.

Be careful with your blood sugar levels!

The main side effect of pentamidine is that it can change blood sugar levels. Sometimes it can be very high, and sometimes it can be very low. It is important to be aware of these symptoms.

  • Symptoms of high blood sugar: excessive thirst, frequent urination, fruity breath odor, and excessive sleepiness.
  • Symptoms of low blood sugar: extreme hunger, pale skin, headache, restlessness, tremors, and sweating.

If you experience any of these symptoms , tell the doctor or nurse treating you immediately.

Side Effects
If these symptoms occur, notify medical staff immediately.
Allergic reactions Skin rash, itching, swelling of the face, lips or tongue.
Breathing difficulties Difficulty breathing, wheezing.
Changes in heart rate Chest pain, fast or irregular heartbeat.
Other severe symptoms Nausea, fever, chills, unusual bleeding or bruising, yellowing of the eyes or skin, difficulty urinating, pain or redness at the injection site.
These are usually not serious, but if they persist, tell your doctor.
Digestive system problems Diarrhea, nausea, stomach pain, vomiting.
Other minor features Headache, metallic taste in the mouth, muscle pain.

💡 Take-Home Message

  • Pentamidine is a powerful vaccine used to treat a severe pneumonia condition called Pneumocystis carinii pneumonia (PCP) .
  • This medicine is given in a hospital, under the close supervision of medical staff. This is not a medicine to take home.
  • If you have diabetes, heart disease, kidney disease, or other allergies, tell your doctor before starting the medication.
  • It is imperative to inform your doctor about all other medications you are taking (including traditional medicines).
  • Be aware of changes in your blood sugar levels (such as excessive thirst, shakiness) while taking this medication. If you notice any changes, tell your medical staff immediately.
  • If you experience symptoms such as severe allergic reactions, chest pain, or difficulty breathing, notify medical staff immediately.
❓ FAQ

Frequently Asked Medical Questions (FAQ)

Evidence-based clinical answers to common patient questions

Do you give this to small children?

Yes, in some special cases, this medicine can be prescribed to children as young as 4 months old. But it should be done with great caution and under the close supervision of a pediatrician.

What if the medication dose increases?

Since this is given in a hospital setting, the risk of overdose or overdose is very low. If there is any suspicion of such a thing, the medical staff will take the necessary action immediately. If you have any concerns about this, it is important to immediately go to the ETU (Emergency Treatment Unit) or call the National Poisons Information Centre at the Colombo National 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.