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1. www.webmd.com › interaction-checkerDrug Interaction Checker - Find Interactions Between Medications

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   2024年6月26日 · What Are Drug Interactions? When a medication works right, it boosts your health or helps you feel better. But a drug can bring on problems if it doesn't mix well with something else you put into...

2. www.webmd.com › pill-identificationPill Identifier - Find Pills by Color, Shape, Imprint, or ...

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   2021年1月1日 · Use WebMD’s Pill Identifier to find and identify any over-the-counter or prescription drug, pill, or medication by color, shape, or imprint and easily compare pictures of multiple drugs.

3. www.webmd.com › depression › featuresSerotonin and Depression: 9 Questions and Answers

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   • Pharmacology
   • Synthesis
   • Function
   • Pathophysiology
   • Causes

   Serotonin acts as a neurotransmitter, a type of chemical that helps relay signals from one area of the brain to another. Although serotonin is manufactured in the brain, where it performs its primary functions, some 90% of our serotonin supply is found in the digestive tract and in blood platelets.

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   Serotonin is made via a unique biochemical conversion process. It begins with tryptophan, a building block to proteins. Cells that make serotonin use tryptophan hydroxylase, a chemical reactor which, when combined with tryptophan, forms 5-hydroxytryptamine, otherwise known as serotonin.

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   As a neurotransmitter, serotonin helps to relay messages from one area of the brain to another. Because of the widespread distribution of its cells, it is believed to influence a variety of psychological and other body functions. Of the approximately 40 million brain cells, most are influenced either directly or indirectly by serotonin. This includ...

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   There are many researchers who believe that an imbalance in serotonin levels may influence mood in a way that leads to depression. Possible problems include low brain cell production of serotonin, a lack of receptor sites able to receive the serotonin that is made, inability of serotonin to reach the receptor sites, or a shortage in tryptophan, the...

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   One theory about how depression develops centerson the regeneration of brain cells -- a process that some believe is mediated by serotonin, and ongoing throughout our lives. According to Princeton neuroscientist Barry Jacobs, PhD, depression may occur when there is a suppression of new brain cells and that stress is the most important precipitator ...

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4. www.webmd.com › heart-disease › atrial-fibrillationUnderstanding Arrhythmia: Causes, Symptoms, and Treatment ...

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   2023年10月4日 · An arrhythmia (pronounced as “ uh-RITH-me-uh”) is an irregular heartbeat. This means your heart is out of its usual rhythm. About 1.5%-5% of people have arrhythmias. It may feel like your heart...

5. www.webmd.com › covid › covid-19-symptomsCoronavirus Symptoms: Early Signs, Serious Symptoms - WebMD

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   2023年11月10日 · COVID-19 is a respiratory condition caused by a coronavirus. Some people are infected but don’t notice any COVID-19 symptoms (doctors call that being asymptomatic). Most people have mild symptoms...

6. www.webmd.com › heart-disease › atrial-fibrillationHeart Rate Myths and Facts: Normal Heart Rate, Resting Heart ...

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   2015年5月20日 · Written by Kara Mayer Robinson. 1. Myth: A normal heart rate is 60-100 beats per minute. 2. Myth: An erratic heart rate means I'm having a heart attack. 3. Myth: If my pulse is fast, it always...

7. www.webmd.com › erectile-dysfunction › how-an-erection-occursPenis: Anatomy, Picture, Erection, and Ejaculation - WebMD

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   2024年5月17日 · Also known as impotence, erectile dysfunction (ED) is the inability to have or maintain an erection adequate for sex. If you have a penis, you are bound to experience ED at one time or another ...