NZ Formulary

Linezolid (liquid)


What does it do?

Linezolid is used to treat bacterial infections.

How should you take it?

Take linezolid regularly as directed. Keep taking it until the course is finished, even if you start to feel better.
Measure the liquid carefully with an oral syringe or measuring spoon. Gently turn the bottle upside down a few times before measuring each dose but do not shake the bottle.

What if you forget a dose?

If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Some medicines available without a prescription may react with linezolid including:

  • some migraine medicines, such as sumatriptan (e.g. Sumagran Active®) or zolmitriptan (e.g. Zomig®)
  • cold and flu medicines containing dextromethorphan (e.g. Robitussin Dry Cough Forte®) or phenylephrine (e.g. Sudafed PE®)

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort) or recreational drugs.

Important information continues on next page.

What side effects might you notice?

Side EffectsRecommended action

Reduced number of blood cells that fight infections or help your blood to clot - symptoms include: fever, chills, sore throat or generally feeling unwell, or easy or unusual bruising or bleeding


Changes in vision

Tell your doctor immediately

Numbness or tingling of the fingers or toes

Severe or persistent diarrhoea, abdominal pain

Tell your doctor

Diarrhoea, stomach upset


Changes in taste

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have kidney problems, have ever had a seizure, or if you have depression.
  • Some people who take linezolid may be very sensitive to tyramine which is present in some foods and alcohol (e.g. cheese, meat or yeast extracts (e.g. Marmite®, Vegemite®, Oxo®), pickled fish, broad bean pods, sauerkraut, salami and protein drinks). People taking high doses of linezolid may need to avoid large amounts of these. Discuss with your health professional.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Very rarely, linezolid can cause a serious condition called lactic acidosis. Stop taking linezolid and tell your doctor immediately if you are feeling very unwell or unusually tired, or if your breathing becomes faster than normal.
  • Linezolid can cause a serious condition called serotonin toxicity when used with some other medicines. Stop taking linezolid and tell your doctor immediately if you are feeling confused, have muscle twitching or shaking you can’t control, heavy sweating, or a fever.
  • You will need regular blood tests while taking linezolid to monitor its effects on your blood.
  • Store linezolid liquid as directed. Once the course is finished, take any leftover liquid back to your pharmacy.
  • Tell your doctor if you have phenylketonuria (PKU). The linezolid liquid may contain aspartame (a source of phenylalanine).