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Generic name: dronabinoldroe-NAH-bih-nol ]
Brand names: Marinol, Syndros
Drug class: Miscellaneous antiemetics

Medically reviewed by on Jan 23, 2023. Written by Cerner Multum.

What is Syndros?

Syndros is a man-made form of cannabis (also known as marijuana).

Syndros is used to treat loss of appetite that causes weight loss in people with AIDS.

Syndros is also used to treat severe nausea and vomiting caused by cancer chemotherapy. This medicine is usually given after medicines to control nausea and vomiting have been tried without success.

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

Syndros side effects

Get emergency medical help if you have signs of an allergic reaction: hives, skin rash or burning; mouth sores; warmth, redness, or tingly feeling; difficult breathing; swelling of your face, lips, tongue, or throat.

Syndros may cause serious side effects. Call your doctor at once if you have:

Common side effects of Syndros may include:

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.


Syndros may cause new or worsening psychosis (unusual thoughts or behavior), especially if you have ever had depression or mental illness.

You should not use Syndros capsules if you are allergic to sesame oil. You should not use this medicine oral solution if you have had an allergic reaction to alcohol or if you also use disulfiram (Antabuse) or metronidazole (Flagyl).

Syndros can raise or lower blood pressure, especially in older adults or in people with heart problems.

Call your doctor at once if you have new or worsening mood symptoms, changes in behavior, headaches, vision problems, rapid heartbeats, or severe dizziness.

Before taking this medicine

You should not use Syndros if you are allergic to it.

You should not take Syndros capsules if you are allergic to sesame oil.

Syndros oral solution (liquid medicine) contains alcohol. You should not take this medicine liquid if you have ever had an allergic reaction to alcohol or if you also use disulfiram (Antabuse) or metronidazole (Flagyl). Do not take this medicine liquid within 14 days after or 7 days before using disulfiram or metronidazole.

Tell your doctor if you have ever had:

It is not known whether Syndros will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

HIV can be passed to your baby if you are not properly treated during pregnancy. If you have HIV or AIDS, take all of your medicines as directed to control your infection.

Women with HIV or AIDS should not breastfeed a baby. Even if your baby is born without HIV, the virus may be passed to the baby in your breast milk. However, if you are being treated for nausea and vomiting caused by cancer chemotherapy and you are breastfeeding, your doctor should check the weight of your baby often.

Syndros is not approved for use by anyone younger than 18 years old.

How should I take Syndros?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed. Tell your doctor if you feel an increased urge to use more of this medicine.

Syndros may be habit-forming. Misuse can cause addiction, overdose, or death. Keep the medication in a place where others cannot get to it. Selling or giving away this medicine is against the law.

To stimulate appetite in people with AIDS, Syndros is usually taken 1 hour before lunch and 1 hour before dinner.

To prevent nausea and vomiting caused by chemotherapy:

Older adults may need to take this medicine less often. Follow your doctor's dosing instructions very carefully.

Swallow the capsule whole and do not crush, chew, break, or open it.

Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).

Take the liquid medicine with a full glass of water.

You may need to follow a special diet while using Syndros. Follow all instructions of your doctor or dietitian. Learn about the foods you should eat to help boost your food intake.

Call your doctor if your symptoms do not improve, or if they get worse while using Syndros.

Do not stop using Syndros suddenly after long-term use, or you could have unpleasant withdrawal symptoms. Ask your doctor how to safely stop using this medicine.

Store the capsules or unopened liquid medicine in a tightly-closed container in the refrigerator. Do not freeze.

You may also store the capsules at cool room temperature, away from moisture and heat. After opening the liquid medicine, store it at room temperature. Throw away any unused liquid 42 days after opening the bottle.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

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

Overdose symptoms may include changes in mood, memory problems, little or no urinating, constipation, loss of energy, problems with speech or coordination, or feeling light-headed.

What should I avoid while taking Syndros?

Do not use marijuana while taking Syndros.

Avoid driving or operating machinery until you know how Syndros will affect you. Dizziness or severe drowsiness can cause falls or other accidents.

Do not drink alcohol while taking Syndros.

What other drugs will affect Syndros?

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Using Syndros with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.

Other drugs may affect Syndros, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.

Popular FAQ

Syndros (dronabinol) is a cannabinoid used to treat loss of appetite (anorexia) associated with weight loss in patients with AIDS (Acquired Immune Deficiency Syndrome). It is also used to treat nausea and vomiting in patients receiving cancer chemotherapy who haven't responded to the usual antiemetic treatments. Continue reading

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.