What is serotonin syndrome syndrome?
Serotonin syndrome is when your body has too much of a chemical called serotonin, usually because of a medication or combinations of medications. Your body makes serotonin to help your brain cells and other nervous system cells communicate with each other.
What is serotonin syndrome pathophysiology?
Serotonin syndrome (SS) (also referred to as serotonin toxicity) is a potentially life-threatening drug-induced toxidrome associated with increased serotonergic activity in both the peripheral (PNS) and central nervous systems (CNS).

What antidepressant does not cause serotonin syndrome?
There is an antidepressant called reboxetine, which never made it to the U.S. but is widely used in Europe and Canada. Reboxetine works entirely through the norepinephrine system and has no direct effects on serotonin whatsoever.
Can you get serotonin syndrome from gabapentin?
Research has indicated that gabapentin can cause serotonin syndrome, especially when taken with other drugs like tramadol. One study found that a 66-year old man who took a combination of tramadol and gabapentin after spinal surgery experienced serotonin syndrome.
What is neuroleptic malignant syndrome?
INTRODUCTION Neuroleptic malignant syndrome (NMS) is a life-threatening neurologic emergency associated with the use of antipsychotic (neuroleptic) agents and characterized by a distinctive clinical syndrome of mental status change, rigidity, fever, and dysautonomia.

What are the first signs of serotonin syndrome?
Symptoms
- Agitation or restlessness.
- Insomnia.
- Confusion.
- Rapid heart rate and high blood pressure.
- Dilated pupils.
- Loss of muscle coordination or twitching muscles.
- High blood pressure.
- Muscle rigidity.
What causes neuroleptic malignant syndrome?
Causes. Neuroleptic malignant syndrome comes about, most likely, as a result of “dopamine D2 receptor antagonism”. Dopamine is a chemical substance (neurotransmitter) found in the brain and elsewhere in the central nervous system that acts to convey messages from one cell to another.
How do you get rid of serotonin syndrome?
Depending on your symptoms, you may receive the following treatments:
- Muscle relaxants.
- Serotonin-production blocking agents.
- Oxygen and intravenous (IV) fluids.
- Drugs that control heart rate and blood pressure.
- A breathing tube and machine and medication to paralyze your muscles.
Should I worry about serotonin syndrome?
However, severe serotonin syndrome can be life-threatening and if you experience any of the symptoms below you should seek emergency treatment immediately: Irregular heartbeat. High fever (>103 F/40 C) Seizures.
Does Benadryl help serotonin syndrome?
The prescription antihistamine, cyproheptadine, works as an antidote for excessive serotonin, but other antihistamines, like Benadryl (diphenhydramine), work differently. In fact, diphenhydramine slightly increases serotonin levels and could make the condition worse.
What is the difference between malignant hyperthermia and neuroleptic malignant syndrome?
Malignant hyperthermia is extremely rare in the postoperative setting, and serotonin syndrome has a faster onset and neuromuscular hyperactivity while neuroleptic malignant syndrome has a slower onset and neuromuscular hypoactivity.
What happens with neuroleptic malignant syndrome?
Symptoms of neuroleptic malignant syndrome usually include very high fever (102 to 104 degrees F), irregular pulse, accelerated heartbeat (tachycardia), increased rate of respiration (tachypnea), muscle rigidity, altered mental status, autonomic nervous system dysfunction resulting in high or low blood pressure.
What are serotonin syndrome and neuroleptic malignant syndrome?
Serotonin syndrome (SS) and neuroleptic malignant syndrome (NMS) are each rare psychiatric emergencies that can lead to fatal outcomes.
What is the difference between NMS and serotonin syndrome?
NMS and serotonin syndrome are rare, but potentially life-threatening, medicine-induced disorders. Features of these syndromes may overlap making diagnosis difficult. However, NMS is characterised by ‘lead-pipe’ rigidity, whilst serotonin syndrome is characterised by hyperreflexia and clonus.
What are the signs and symptoms of neuroleptic malignant syndrome (NMS)?
Neuroleptic malignant syndrome is generally characterized by a variety of symptoms, some of which may be shared with SS. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteria for NMS include the following symptoms: severe muscle rigidity, hyperpyrexia (>38°C), mental status alteration, and autonomic instability.
Can prehospital personnel make a difference in treating neuroleptic malignant syndrome?
Although Neuroleptic Malignant Syndrome and Serotonin Syndrome are rare disorders, prehospital personnel can make a difference with early recognition and aggressively managing the patient’s symptoms. (Photo/National Highway Traffic Safety Administration)