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Thermoject (flush)

Generic name: sodium chloride (flush) (SOE dee um KLOR ide)
Brand name: BD PosiFlush SF, Normal Saline Flush, Swabflush, Syrex, Thermoject, Tip-Lok Diluent
Drug class: Minerals and electrolytes, Miscellaneous respiratory agents

Medically reviewed by on Apr 20, 2021. Written by Cerner Multum.

What is Thermoject flush?

Thermoject is the chemical name for salt. This medicine can reduce some types of bacteria.

Thermoject is used to clean out an intravenous (IV) catheter, which helps prevent blockage and removes any medicine left in the catheter area after you have received an IV infusion.

Thermoject may also be used for purposes not listed in this medication guide.


Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

Before taking this medicine

Before using Thermoject, tell your doctor if you are allergic to any drugs.

How should I use Thermoject flush?

Use exactly as prescribed by your doctor. Do not use in larger or smaller amounts or more often than recommended.

You will use Thermoject each time you use your IV catheter. Follow your doctor's instructions about how many times per day to use the flush.

Before using the flush, check the solution container to make sure there are no leaks in it. Do not use the medication if it has changed colors or has particles in it. Call your doctor for a new prescription.

Call your doctor or tell your caregivers if your catheter, needle, or IV tubing becomes blocked or if the flush or IV medicine is not flowing normally.

Throw away used needles in a puncture-proof "sharps" disposal container (ask your pharmacist where to get one and how to throw it away). Keep this container out of the reach of children and pets.

Store Thermoject at room temperature away from moisture and heat. Keep all of your catheter flush supplies in a clean dry place when not in use.

What happens if I miss a dose?

If you use flush your catheter each time you use it, you are not likely to miss a dose.

What happens if I overdose?

An overdose of Thermoject flush is unlikely to occur.

What should I avoid while using sodium chloride flush?

Follow your doctor's instructions about any restrictions on food, beverages, or activity.

Thermoject flush side effects

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

Stop using Thermoject and call your doctor at once if you have any of these side effects while using the flush:

  • severe irritation;

  • swelling;

  • warmth;

  • redness;

  • oozing; or

  • pain.

Common side effects may include:

  • cold feeling or mild burning; or

  • mild irritation around the catheter.

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

What other drugs will affect Thermoject flush?

It is not likely that other drugs you take orally or inject will have an effect on Thermoject used to flush your catheter. But many drugs can interact with each other. Tell each of your health care providers about all medicines you use, including prescription and over-the-counter medicines, vitamins, and herbal products.

Does Thermoject interact with my other drugs?

Enter other medications to view a detailed report.

More about Thermoject (sodium chloride)

Consumer resources

Other brands
Hyper-Sal, NebuSal, Swabflush, PulmoSal, ... +2 more

Professional resources

Related treatment guides

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.