Description

Antidepressants are the most commonly prescribed class of medications for depression and anxiety. This guide covers the major types, how they work, what conditions they treat, and how to access a licensed provider online for evaluation and prescriptions.

Antidepressants: Types, How They Work, and How to Get a Prescription Online

TLDR

Antidepressants include SSRIs, SNRIs, tricyclic antidepressants (TCAs), MAOIs, and atypical agents. The right choice depends on your diagnosis, symptoms, side effect tolerance, and medical history. A licensed psychiatric provider can evaluate you online and, when appropriate, prescribe antidepressant medication the same day.

What Are Antidepressants?

Antidepressants are prescription medications that adjust neurotransmitter activity in the brain to reduce symptoms of depression, anxiety, and related conditions. They are among the most widely prescribed medications in the United States — roughly 1 in 8 adults takes an antidepressant in any given year.

Despite the name, antidepressants treat more than depression. They are first-line treatments for:

• Major depressive disorder (MDD)
• Generalized anxiety disorder (GAD)
• Social anxiety disorder
• Panic disorder
• OCD (obsessive-compulsive disorder)
• PTSD
• PMDD
• Eating disorders (particularly Prozac for bulimia)

Types of Antidepressants

SSRIs (Selective Serotonin Reuptake Inhibitors)

The most commonly prescribed antidepressants. SSRIs block the reuptake of serotonin, increasing its availability in the synaptic cleft. They are considered first-line for most depressive and anxiety disorders.

Best for: Depression, GAD, social anxiety, panic disorder, OCD, PTSD, PMDD.

Common side effects: nausea, insomnia, sexual dysfunction, weight changes (usually modest). Most side effects are worst in the first 1-2 weeks and subside.

SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)

Block both serotonin and norepinephrine reuptake. Often useful when SSRIs haven't worked or when chronic pain co-occurs with depression or anxiety.

• Venlafaxine (Effexor XR)
• Duloxetine (Cymbalta) — FDA-approved for neuropathic pain and fibromyalgia in addition to depression and GAD
• Desvenlafaxine (Pristiq)

Atypical Antidepressants

Medications that do not fit neatly into SSRI or SNRI categories:

• Bupropion (Wellbutrin): Norepinephrine-dopamine reuptake inhibitor. Does not cause sexual dysfunction or weight gain typical of SSRIs. Also prescribed for ADHD and smoking cessation.
• Mirtazapine (Remeron): Enhances serotonin and norepinephrine via receptor blockade. Often used when sedation or appetite increase is a treatment goal.
• Trazodone: Primarily used for insomnia at low doses; also effective for depression at higher doses.
• Vortioxetine (Trintellix): SSRI-plus with additional serotonin receptor activity; often chosen when cognitive symptoms are prominent.

Tricyclic Antidepressants (TCAs)

Older class with broader mechanisms affecting serotonin, norepinephrine, and other receptor systems. Effective but carry more side effects than SSRIs or SNRIs — including cardiac risk in overdose. Typically prescribed when newer agents have not worked.

Common TCAs: amitriptyline (Elavil), nortriptyline (Pamelor), imipramine (Tofranil), doxepin (Silenor for insomnia)

Also prescribed for: migraines, neuropathic pain, OCD.

For a detailed head-to-head comparison, see How Do SSRIs and Tricyclics Differ?

MAOIs (Monoamine Oxidase Inhibitors)

The oldest class of antidepressants. Effective for atypical depression and treatment-resistant cases, but require significant dietary restrictions (no tyramine-rich foods) and have numerous drug interactions. Rarely a first-line option today.

How to Choose the Right Antidepressant

No single antidepressant works for everyone. Factors your provider weighs:

• Diagnosis: Different conditions respond differently (Prozac for OCD, Cymbalta for pain and depression, Wellbutrin for depression with ADHD overlap)
• Side effect preferences: Sexual side effects, weight, sedation, activation — patients weigh these differently
• Prior response: A medication that worked for a close family member is statistically more likely to work for you, due to shared genetic metabolism
• Other medications: Drug interactions narrow the list significantly
• Medical history: Cardiac conditions may exclude TCAs; liver disease affects drug metabolism

Finding the right antidepressant often requires trying 1-3 medications over several months. This is a normal part of treatment, not a sign of failure.

How to Get an Antidepressant Prescription Online

All major antidepressants — SSRIs, SNRIs, bupropion, mirtazapine, TCAs — are non-controlled medications. They can be prescribed via telehealth without any in-person visit requirement.

The process:

1. Book a video appointment with a licensed psychiatric provider (psychiatrist, PMHNP, or similar)
2. Complete your intake: Describe your symptoms, how long you've had them, what treatments you've tried, and your medical history
3. Attend your video evaluation: Your provider assesses your symptoms, asks follow-up questions, and proposes a diagnosis and treatment plan
4. Prescription sent to your pharmacy: If medication is appropriate, the provider sends the prescription electronically for same-day pickup

Most platforms offer follow-up appointments at 2-4 weeks to assess your response and adjust as needed.

What to Expect When Starting an Antidepressant

• Onset: Most antidepressants take 4-6 weeks to reach full effect. Some patients notice early improvements within 1-2 weeks.
• Early side effects: Nausea, headache, and sleep changes are most common in the first two weeks and typically resolve.
• Sexual side effects: Most common with SSRIs and SNRIs. Often dose-dependent and manageable.
• Discontinuation: Do not stop antidepressants abruptly. Most require a gradual taper under provider supervision.

Get Evaluated Online

Klarity Health connects patients with 2,000+ licensed psychiatric providers for online depression and anxiety evaluations. Your provider will assess your symptoms, discuss treatment options, and — when appropriate — send a prescription to your pharmacy the same day.

See if you may qualify at helloklarity.com

This content is for educational purposes and is not a substitute for professional medical advice. Treatment decisions are made by licensed healthcare providers based on individual clinical evaluation. Insurance coverage for telehealth visits may vary; verify your benefits before booking.