On this page · 8 sections

Pentam 300

Generic name: pentamidine

Brand names: Nebupent, Pentam 300

Used for pneumonia
Last updated November 3, 2026 0 views
Share

What is Pentam 300?

Pentam 300 is a medicine that fights infections caused by fungus.

Pentam 300 is used to prevent and treat pneumonia caused by Pneumocystis jiroveci (carinii).

Pentam 300 may also be used for reasons not mentioned in this medication guide.

This section was rewritten for readability and reviewed for meaning.

Warnings

Follow all instructions on your medicine label and package. Inform each of your healthcare providers about all your medical conditions, allergies, and all medicines you are using.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

You should not use Pentam 300 if you are allergic to it.

To ensure Pentam 300 is safe for you, tell your doctor if you have:

  • high or low blood pressure;
  • a heart rhythm disorder;
  • diabetes, or low blood sugar (hypoglycemia);
  • a pancreas disorder;
  • a severe skin rash called Stevens-Johnson syndrome;
  • anemia (low red blood cells);
  • low white blood cells or low platelets in your blood;
  • low levels of calcium or high levels of potassium in your blood;
  • liver or kidney disease; or
  • a history of smoking or asthma.

FDA pregnancy category C. It is not known whether Pentam 300 will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication.

It is not known whether pentamidine passes into breast milk or if it could harm a nursing baby. You should not breast-feed while using Pentam 300.

Inhaled Pentam 300 should not be given to a child without the advice of a doctor.

This section was rewritten for readability and reviewed for meaning.

Pentam 300 side effects

Get emergency medical help if you notice any signs of an allergic reaction: hives; trouble breathing; swelling of your face, lips, tongue, or throat.

Pentam 300 may cause serious side effects. Call your doctor right away if you experience:

  • wheezing, choking, or other breathing issues after using this medication with a nebulizer;
  • feeling light-headed, as if you might faint;
  • fast or irregular heartbeat;
  • painful or difficult urination;
  • confusion, hallucinations;
  • pain, burning, irritation, or changes in the skin where the injection was given;
  • worsening symptoms or signs of a new infection (fever, cough, trouble breathing, night sweats);
  • a blood cell disorder--pale skin, feeling light-headed or short of breath, easy bruising, unusual bleeding, purple or red pinpoint spots under your skin;
  • pancreatitis--severe pain in your upper stomach that spreads to your back, nausea and vomiting;
  • low blood sugar--headache, hunger, weakness, sweating, confusion, irritability, dizziness, or feeling jittery; or
  • severe skin reaction--fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially on the face or upper body) and causes blistering and peeling.

Common side effects of Pentam 300 may include:

  • loss of appetite; or
  • unusual or unpleasant taste in the mouth.

This is not a complete list of side effects, and others may happen. Contact your doctor for medical advice about side effects. You can report side effects to the FDA at 1-800-FDA-1088.

This section was rewritten for readability and reviewed for meaning.

How is Pentam 300 given?

Pentam 300 is given either as an injection, or as in inhaled medicine using a nebulizer. Follow all directions on your prescription label. Do not use this medicine in larger or smaller amounts or for longer than recommended.

Pentam 300 is a powder medicine that must be mixed with a liquid (diluent) before using it as an injection or with a nebulizer. If you are using this medicine at home, be sure you understand how to properly mix and store the medicine. Use only the diluent provided with your medication.

To use Pentam 300 as an injection:

  • Pentam 300 is injected into a muscle, or into a vein through an IV. You may be shown how to use an IV at home. Do not self-inject this medicine if you do not understand how to give the injection and properly dispose of used needles, IV tubing, and other items used to inject the medicine.
  • Do not use Pentam 300 if it has changed colors or has particles in it. Call your pharmacist for new medication.
  • Tell your caregivers if you feel any burning, pain, or swelling around the IV needle when Pentam 300 is injected.
  • Use a disposable needle only once, then throw away in a puncture-proof container (ask your pharmacist where you can get one and how to dispose of it). Keep this container out of the reach of children and pets.

To use Pentam 300 with a nebulizer:

  • After mixing your medicine with the diluent, pour all of the mixture into the chamber of the nebulizer. Attach the mouthpiece or face mask, then attach the drug chamber to the compressor.
  • Do not mix any other medicines in the nebulizer with Pentam 300.
  • Sit upright in a comfortable position. Place the mouthpiece into your mouth or put on the face mask, covering your nose and mouth. Turn on the compressor.
  • Breathe in slowly and evenly until no more mist is formed by the nebulizer and the drug chamber is empty.
  • Clean the nebulizer after each use. Follow the cleaning directions that came with your nebulizer.

If you are diabetic, check your blood sugar carefully while you are receiving Pentam 300. This medicine can raise or lower your blood sugar.

While using Pentam 300, you may need frequent blood tests. Your heart function may need to be checked using an electrocardiograph or ECG (sometimes called an EKG).

Store unmixed medicine at room temperature away from moisture, heat, and light.

Mixed medicine must be used within a certain number of hours, depending on the diluent. Carefully follow the mixing and storage instructions provided with your medicine. Ask your pharmacist if you have questions.

Pentam 300 contains no preservative. Throw away any unused medicine.

What happens if I miss a dose?

Call your doctor for guidance if you miss a dose of Pentam 300.

This section was rewritten for readability and reviewed for meaning.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Follow your doctor's instructions about any limits on food, drinks, or activities.

This section was rewritten for readability and reviewed for meaning.

What other drugs will affect Pentam 300?

Other drugs may interact with pentamidine, including prescription and over-the-counter medicines, vitamins, and herbal products. Inform each of your health care providers about all medicines you are currently using and any medicines you begin or discontinue.

This section was rewritten for readability and reviewed for meaning.

Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
General medicine information Consumer-friendly language

Content is provided for education and is not medical advice. See our medical disclaimer.