We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.
Health

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What are the Signs of an Antidepressant Overdose?

By Vanessa Harvey
Updated: May 17, 2024

The signs and symptoms of an antidepressant overdose are numerous and can be placed into two broad categories: initial and late. Initial signs and symptoms tend to be mild and develop within the first two hours of the overdose. They include drowsiness, an accelerated heartbeat, headache and a dry mouth. Other early signs and symptoms of an antidepressant overdose are dilated pupils, hallucinations, high blood pressure, confusion and agitation. These early signs can quickly bring on later signs of an overdose, such as convulsions, loss of consciousness, respiratory arrest and death if medical attention is not received.

Some people who suffer from these signs and symptoms of an antidepressant overdose also will experience blurred vision, fever, involuntary contractions of the muscles, tremors and urinary retention. Involuntary muscle contractions could, in some individuals, be accompanied by rigidity. Agitation and hallucinations are symptoms of an antidepressant overdose. The heart, the brain and the spinal cord are the organs affected in cases of an antidepressant overdose.

Antidepressants help treat depression by interfering with the reuptake of serotonin and norepinephrine, which are neurotransmitters in the brain. Interference with these chemicals cause their levels to rise, and high levels can easily harm various parts of the brain and the spinal cord. Sodium channels also are affected by such a drug overdose, leading to the cardiac arrhythmias often seen in these cases. Contractions of the heart are jeopardized when sodium is not properly displaced into and out of the cells.

Acetylcholine is another neurotransmitter in the brain that is blocked by antidepressants. It is involved in the stimulation of muscle contractions, particularly the muscles of the gastrointestinal system. This is why peristalsis — the involuntary muscle contractions that occur in the esophagus and the intestines — might become abnormal in cases of an overdose. The best way for a person to help avoid suffering an antidepressant overdose is to follow the instructions given by the doctor who prescribed them.

WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
Share
WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.