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Key takeaways
The first step in treating serotonin syndrome is discontinuing the offending medication and seeking emergency medical help. Medication and supportive care may be required, depending on the symptoms.
There are no over-the-counter medicines or natural remedies that treat serotonin syndrome.
It is important to be aware of medications that are associated with serotonin syndrome, such as antidepressants, and always check with a healthcare provider before starting or stopping any medication.
Serotonin syndrome (or serotonin toxicity) is caused by excessive serotonin levels in the body. Serotonin syndrome can result from an increase in the dose of a serotonin-raising drug, from taking two or more serotonin-raising drugs or dietary supplements, or even from deliberate self-poisoning. It is important to know the symptoms of serotonin syndrome, so you can seek medical help right away.
How is serotonin syndrome diagnosed?
Symptoms can vary in terms of type and severity, and may include:
Agitation
Restlessness
Abnormal eye movements
Nausea, vomiting, and diarrhea
Fast heartbeat
High blood pressure or rapid fluctuations in blood pressure
Hallucinations
Fever
Problems with coordination and reflexes
Serotonin syndrome may range from mild to life-threatening. If you have any of the above symptoms, especially if you take a medication that affects your serotonin levels, you should get medical help right away.
There is no single test to diagnose serotonin syndrome. Healthcare providers typically take a medical history and conduct a physical exam to diagnose serotonin syndrome. This, along with a history of taking one or more medication(s) that affect serotonin levels, helps the healthcare provider make a diagnosis and figure out the next steps. In some cases, they may order additional tests to rule out other conditions.
Serotonin syndrome treatment options
Serotonin syndrome is treated by discontinuing serotonergic drugs (drugs that affect serotonin levels), stabilizing vital signs, and managing complications. Patients with severe symptoms may require hospitalization or even admission to an intensive care unit.
Hospitalization
Even mild cases will usually require monitoring in an emergency room or clinic. Severe serotonin syndrome will require hospital care or admission to an ICU. Sedation, blood pressure medications, serotonin blockers, IV fluids, oxygen, cooling, and vital signs monitoring are the standard therapies, depending on the symptoms and vital signs. For an extremely high fever, a patient may also need to be sedated, put on a mechanical ventilator, and given muscle-paralyzing drugs.
Medications
Mild cases of serotonin syndrome typically resolve in one to three days after discontinuing serotonergic medications. Symptoms such as anxiety and tremor may be brought under control with a drug from a class of sedatives called benzodiazepines. If symptoms do not resolve, a healthcare provider may use drugs that block the action of serotonin. Blood pressure will be brought under control by short-acting blood pressure medications.
Types of serotonin syndrome medication
There is no cure for serotonin syndrome. Even the most dangerous incidents of serotonin syndrome resolve relatively quickly when serotonin medications are withdrawn, and supportive care is given. Medications may be used to manage the symptoms and stabilize vital signs.
Benzodiazepines
Benzodiazepines such as diazepam and lorazepam are sedatives. They are the first-line medication to reduce agitation and muscle stiffness and prevent seizures.
Serotonin blockers
Serotonin blockers may be used if benzodiazepines fail to calm a patient down. While several medications block serotonin, the most commonly used drug is cyproheptadine.
Blood pressure medications
Dangerously high blood pressure caused by serotonin syndrome may be treated with short-acting antihypertensives (drugs that lower blood pressure) such as esmolol or nitroprusside.
Sympathomimetic agents
Low blood pressure caused by serotonin syndrome may be treated with sympathomimetic agents such as norepinephrine, epinephrine, or phenylephrine. These drugs both speed up the heart and cause blood vessels to constrict, increasing blood pressure.
Paralytic agents
In severe cases of serotonin syndrome, dangerously high fever is caused by excessive muscle contractions rather than the brain’s “thermostat.” For this reason, traditional fever medications (antipyretics) will not work. Instead, the muscle contractions causing the fever must be stopped. Patients will be hospitalized, sedated, put on a mechanical ventilator, and partially paralyzed with a neuromuscular blocker such as vecuronium.
Other medications
Depending on the situation, other medications or supportive care may be required, such as IV fluids to keep vital signs stable.
Over-the-counter serotonin syndrome medicine
There is no over-the-counter medicine that can be used to treat serotonin syndrome. It’s important to note, though, that because of the potential for serotonin syndrome, you should always check with a healthcare provider or your pharmacist before taking an OTC medicine, especially if you take a medicine that affects serotonin levels, such as an antidepressant. For example, the cough suppressant dextromethorphan (which is found in many cough and cold remedies) and the natural supplement St. John’s Wort have both been associated with serotonin syndrome.
What's the best treatment for serotonin syndrome?
Mild cases of serotonin syndrome may resolve when serotonergic drugs are discontinued. No medication treats or cures serotonin syndrome. Instead, medications are used to treat symptoms and stabilize vital signs. There is, then, no “best” medication for serotonin syndrome, only medications that best fit the patient’s symptoms and vital signs.
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Medication for serotonin syndrome
| Drug name | See SingleCare price |
|---|---|
| Valium | Get free coupon |
| Diazepam | Get free coupon |
| Ativan | Get free coupon |
| Lorazepam | Get free coupon |
| Cyproheptadine | Get free coupon |
| Esmolol Hcl | Get free coupon |
| Adrenalin | Get free coupon |
| Epinephrine | Get free coupon |
| Vecuronium Bromide | Get free coupon |
This is not an exhaustive list of serotonin syndrome medications. Always ask your healthcare provider for the best treatment for serotonin syndrome based on your health condition and medical history.
Common side effects of serotonin syndrome medicine
Side effects will vary depending on the type of medication used. For example, benzodiazepines as well as cyproheptadine may cause dizziness, drowsiness, and confusion. For more information about potential side effects, talk to a healthcare professional about your specific situation.
Home remedies for serotonin syndrome
Serotonin syndrome can be a potentially hazardous condition. While most cases are mild, the condition could rapidly develop into a life-threatening condition. If you think you have serotonin syndrome, you should go to the emergency room.
There are, however, measures people should adopt to prevent or be ready for serotonin syndrome:
Know the medications you’re taking. If you are prescribed drugs that raise serotonin levels, particularly an SSRI, get to know what other medications, dietary supplements, over-the-counter drugs (OTC), and illicit drugs should not be taken along with your medication. Ask your healthcare provider if you have any questions.
Talk to your healthcare provider. When getting any prescription, inform the healthcare professional about all the medications, over-the-counter drugs, and dietary supplements you take. If you add medications (whether prescription or OTC) or dietary supplements, inform your healthcare provider first before you take them.
Know the signs of serotonin syndrome. When taking any medication affecting serotonin, get to know the signs and symptoms of serotonin syndrome. Educate your family members as well, so they know what to look out for. There will be no confusion. You will not feel right once serotonin syndrome kicks in. Time is of the essence, so getting emergency medical help will help save your life.
Which drugs cause serotonin syndrome?
Serotonin syndrome is caused by drugs that increase serotonin levels in the body. Serotonin syndrome most commonly affects people taking depression medications who are taking too large a dose or who also start taking other drugs that increase serotonin. Many drugs increase serotonin levels, including:
Antidepressant medications (SSRIs, SNRIs, monoamine oxidase inhibitors, and tricyclic antidepressants)
Opioid pain medications such as tramadol or meperidine
Cough suppressants such as dextromethorphan
Migraine drugs such as sumatriptan, naratriptan, or almotriptan
Nausea drugs such as Zofran (ondansetron) or granisetron
Amphetamines such as Adderall
Levodopa
Smoking cessation aids (bupropion)
Metoclopramide, which is used for gastroparesis (slowed stomach emptying) and GERD
An antibiotic called linezolid
Illicit drugs such as cocaine, Ecstasy, and LSD
Dietary or herbal supplements such as St. John’s wort, ginseng, and tryptophan
Expert takeaway
"There are many drugs that have been associated with serotonin syndrome—not just antidepressants but other drugs such as stimulant ADHD medications, certain anti-nausea medicines, and others," says Karen Berger, Pharm.D., member of the SingleCare Medical Review Board. "It is important for your healthcare provider to have a current list of all of your medications, both prescription and OTC, as well as any vitamins or supplements you take. Always check with your healthcare provider before starting or stopping any medication."
Frequently asked questions about serotonin syndrome
Does Benadryl help serotonin syndrome?
Serotonin syndrome should not be treated at home with over-the-counter medications. The prescription antihistamine, cyproheptadine, works as an antidote for excessive serotonin, but other antihistamines, like Benadryl (diphenhydramine), are not used to treat serotonin syndrome.
How is serotonin syndrome treated?
The first step is to stop taking the medication or medications causing serotonin syndrome. Mild to moderate cases of serotonin syndrome may be treated with benzodiazepines such as Valium to calm anxiety, relax the muscles, and prevent seizures. More serious cases may involve cyproheptadine to block serotonin or medications to treat associated symptoms such as high blood pressure. Severe cases may involve hospitalization, intubation, sedation, and being injected with drugs to paralyze the muscles.
How long does it take serotonin syndrome to develop?
Serotonin syndrome can develop within minutes to a few hours after taking a serotonin-enhancing drug (or combination of drugs) that tips the balance into serotonin toxicity.
How long does it take serotonin syndrome to go away?
On average, mild cases of serotonin syndrome resolve in one to three days if serotonergic drugs are stopped. How fast the condition clears up, however, depends on the drug that’s being taken and how long it takes to leave the body. Some people may experience serotonin syndrome symptoms for several weeks after onset.
How do you lower serotonin levels quickly?
When serotonin syndrome symptoms first appear, there is no way to quickly lower serotonin levels other than to discontinue serotonergic drugs and seek hospital treatment. Symptoms typically resolve in a few days, although some cases may last longer.
Is serotonin syndrome reversible?
Serotonin syndrome is an excess of serotonin in the body, usually after taking one or more serotonergic drugs. The condition typically reverses in a few days when those drugs are discontinued, but it may take up to a few weeks, depending on how long the drugs stay in your body.
What happens if serotonin syndrome goes untreated?
Most mild and moderate cases of serotonin syndrome will resolve in a few days, provided medications causing the condition are stopped. If the offending medication is not stopped, serotonin syndrome can become more severe. Severe cases can be fatal without medical intervention.
Sources
Serotonin syndrome, Cleveland Clinic (2026)
Serotonin syndrome, MedlinePlus (2024)
How to spot and prevent serotonin syndrome, Cedars-Sinai (2025)
Serotonin syndrome, Merck Manual (2026)
Serotonin syndrome (serotonin toxicity), UpToDate (2026)
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