What is Zoloft & How it Works

During the COVID-19 pandemic, rates of depression and anxiety surged, leading many Americans to seek relief through antidepressant medication. Even prior to the pandemic, a significant portion of the population relied on antidepressants, with 1 in 8 American adults already taking them.

Shockingly, in 2020, this number increased by 18.6%, indicating the widespread need for mental health support. Among the most commonly prescribed antidepressants was Zoloft, with over 38 million prescriptions in 2017 alone. By 2022, it had climbed to the 12th position among the most prescribed medications in the US, serving over 7 million patients.

Zoloft is a brand name for the generic drug sertraline. It belongs to the selective serotonin reuptake inhibitors (SSRIs) class of antidepressants.

In this article, we’ll explore Zoloft’s mechanism of action, its various applications, potential side effects, and other key details to offer a thorough comprehension of this commonly prescribed medication.

Understanding Zoloft

What is Sertraline (Zoloft) Used For?

Zoloft is often a first-line medication for depression, anxiety, post-traumatic stress disorder (PTSD), and obsessive-compulsive disorder (OCD). It has also received approval from the Food and Drug Administration (FDA) for use in adults to treat:

• Major depressive disorder (MDD)
• Panic disorder
• Premenstrual dysphoric disorder (PMDD)
• Social anxiety disorder

Zoloft also holds FDA approval for treating OCD in children aged six years and older. However, it is not approved for PMDD in teens younger than age 18 years.

Although Zoloft lacks FDA approval for the conditions below, mental health providers or physicians sometimes prescribe it off-label:

• Binge eating disorder
• Body dysmorphic disorder
• Bulimia nervosa (BN)
• Generalized anxiety disorder (GAD)
• Premature ejaculation

How Does Zoloft Work?

Sertraline works primarily by extending the duration of serotonin, a neurotransmitter in the brain that impacts mood. This heightened serotonin level helps to regulate mood, personality, and wakefulness, which are crucial in conditions like major depression.

While it mainly focuses on serotonin, sertraline also has a small effect on other brain chemicals like norepinephrine and dopamine. This broader activity profile contributes to its effectiveness in treating various psychiatric disorders beyond depression, such as anxiety disorders and obsessive-compulsive disorder (OCD).

Zoloft Doses and Administration

Sertraline is usually taken orally once a day, either in the morning or at night. If drowsiness happens, it’s advisable to take it in the evening. Taking sertraline with food might help it absorb better. It comes in different forms:

• Oral tablets: in strengths of 25 mg, 50 mg, and 100 mg
• Capsules: in strengths of 150 mg and 200 mg
• Oral solution: with a strength of 20 mg/ml

The recommended dosage of Zoloft can differ based on the individual’s mental health condition. Typically, the starting dose falls between 25 mg and 50 mg once daily, with a maximum daily intake of 200 mg.

Presented below is a typical dosage suggestion for Zoloft:

For adults and pediatric patients with MDD, OCD, panic disorder, PTSD, and social anxiety disorder, dosage adjustments in increments of 25 to 50 mg per day on a weekly basis are possible if there is an insufficient response, depending on tolerability.

The maximum dosage should not exceed 200 mg per day. Due to Zoloft’s 24-hour elimination half-life, it’s recommended to wait one week between dose changes.

For adult women with PMDD:

• When taking Zoloft continuously, patients who do not respond to a 50 mg dose may increase the dosage by 50 mg increments per menstrual cycle up to a maximum of 150 mg per day.

• For intermittent dosing, patients who do not respond to a 50 mg dose may increase the dosage up to a maximum of 100 mg per day during the next menstrual cycle (and subsequent cycles). This involves taking 50 mg per day for the first three days of the dosing cycle, followed by 100 mg per day for the remaining days of the cycle.

If a dose is missed, it should be taken as soon as possible. However, if it is almost time for the next scheduled dose, the missed dose should be skipped, and the regular dosing schedule should be resumed. Doubling doses should be avoided.

Sertraline (Zoloft) Side Effects

Common Side Effects in Adult Patients

The most common adverse reactions, reported in over 5% of patients and twice as often as in the placebo group, across all placebo-controlled clinical trials with Zoloft  were:

• Nausea
• Diarrhea/loose stool
• Tremor
• Dyspepsia
• Decreased appetite
• Hyperhidrosis
• Ejaculation failure
• Decreased libido
• Somnolence
• Insomnia
• Agitation
• Constipation
• Fatigue
• Dry mouth
• Dizziness
• Abdominal pain
• Malaise

Other side effects reported by less than 5% in pooled placebo-controlled trials in adults include:

• Vomiting
• Palpitations
• Visual impairment

While alterations in sexual desire, performance, and satisfaction are commonly associated with psychiatric conditions, they can also arise as a result of SSRI treatment. Here are potential sexual side effects reported by at least 2% of patients treated with Zoloft:

In men:

• Ejaculation failure
• Decreased libido
• Erectile dysfunction
• Ejaculation disorder
• Male sexual dysfunction

In women:

• Decreased libido

Common Side Effects in Pediatric Patients

The overall adverse reaction profile was generally comparable to that observed in adult studies. Other reactions reported in at least 2% of pediatric patients, and at a rate of at least double that of the placebo, include:

• Fever
• Hyperkinesia
• Urinary incontinence
• Aggression
• Epistaxis
• Purpura
• Arthralgia
• Decreased weight
• Muscle twitching
• Anxiety

Serious Side Effects

While most individuals tolerate the medication well, it’s important to be aware of the potential for serious reactions and to seek medical attention promptly if any concerning symptoms arise. These include:

1. Suicidal Thoughts and Behaviors in Pediatric and Young Adult Patients: It’s unclear if the risk of suicidal thoughts and behaviors in pediatric and young adult patients continues with long-term use. However, evidence from placebo-controlled trials in adults with MDD suggests that antidepressants delay depression recurrence.

2. Serotonin Syndrome:  Zoloft can trigger serotonin syndrome, a potentially life-threatening condition. The risk is higher when Zoloft is used alongside other serotonergic drugs, but it can also occur when these drugs are used alone.

Serotonin syndrome signs and symptoms may include:

• • Mental status changes (agitation, hallucinations, delirium, and coma)
  • Autonomic instability (tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, hyperthermia)
  • Neuromuscular symptoms (tremor, rigidity, myoclonus, hyperreflexia, incoordination)
  • Seizures
  • Gastrointestinal symptoms (nausea, vomiting, diarrhea)

3. Increased Risk of Bleeding: Bleeding events related to drugs affecting serotonin reuptake range from minor issues like ecchymosis, hematoma, epistaxis, and petechiae to life-threatening hemorrhages.

4. Activation of Mania or Hypomania: In bipolar disorder patients, using Zoloft or another antidepressant to treat depression may trigger a mixed or manic episode. Although clinical trials usually excluded bipolar patients, around 0.4% of those on Zoloft reported mania or hypomania symptoms.

5. Seizures: Zoloft has not been systematically studied in patients with seizure disorders and was excluded from clinical trials involving patients with a history of seizures.

6. Angle-Closure Glaucoma: The pupillary dilation caused by certain antidepressant drugs like Zoloft might induce an angle closure attack in patients with narrow angles who lack a patent iridectomy.

7. Hyponatremia: Hyponatremia can develop as a result of SNRI and SSRI treatments, including Zoloft. Symptoms may include:

• Headache
• Difficulty concentrating
• Memory problems
• Confusion
• Weakness
• Unsteadiness, potentially leading to falls

In severe cases:

• Hallucinations
• Fainting
• Seizures
• Coma
• Respiratory failure
• Death

In many instances, hyponatremia is associated with the syndrome of inappropriate antidiuretic hormone secretion (SIADH).

8. False-Positive Effects on Screening Tests for Benzodiazepines: False-positive test results may persist for several days after stopping Zoloft.

Zoloft Withdrawal Symptoms

If doses are missed or medication is suddenly stopped, individuals may experience withdrawal symptoms known as antidepressant discontinuation syndrome. This condition affects approximately 20% of patients who abruptly discontinue antidepressant medication that was taken for at least six weeks.

With discontinuation syndrome, patients may experience the following symptoms:

• Nausea
• Diaphoresis
• Dysphoric mood
• Irritability
• Agitation
• Vertigo
• Sensory disturbances (paresthesia, electric shock sensations)
• Tremor
• Anxiety
• Confusion
• Cephalgia
• Lethargy
• Emotional lability
• Sleep disorder
• Hypomania
• Tinnitus
• Seizures

Reducing the dosage gradually rather than stopping immediately whenever possible is preferable.

Precautions, Warnings, and Interactions

Contraindications of Zoloft

Zoloft is not recommended for use in certain patients due to the risk of serious adverse effects. These contraindications include:

• Patients taking, or within 14 days of stopping, monoamine oxidase inhibitors (MAOIs), including linezolid and intravenous methylene blue.
• Patients taking pimozide.
• Individuals with known hypersensitivity to sertraline.
• Patients who are taking disulfiram.

Use in Specific Populations

• Pregnancy: Using Zoloft in the third trimester of pregnancy may heighten the risk of persistent pulmonary hypertension and neonatal withdrawal symptoms in the newborn.
• Pediatric Use: While Zoloft is approved for pediatric patients with obsessive-compulsive disorder (OCD), its safety and effectiveness have not been established for pediatric patients with other conditions.

Drug Interactions

There are 656 drugs known to interact with Zoloft (sertraline). Among these interactions, 156 are major, 495 are moderate, and five are minor.

Generally, individuals prescribed sertraline should steer clear of nonsteroidal anti-inflammatory drugs (NSAIDs) such as naproxen, aspirin, and ibuprofen, as well as blood thinners and other medications that elevate serotonin levels. Excessive serotonin levels can lead to serotonin syndrome.

Other examples of medications to avoid while taking Zoloft include:

• Adderall (amphetamine/dextroamphetamine)
• Abilify (aripiprazole)
• tramadol
• trazodone
• Wellbutrin XL (bupropion)
• Ativan (lorazepam)
• Fentanyl
• clonazepam
• gabapentin
• Hydroxyzine
• St. John’s Wort
• Antibiotics, such as erythromycin, moxifloxacin, gatifloxacin, and sparfloxacin
• Pain relievers
• Muscle relaxants

Food Interactions

Several foods and beverages should be avoided or limited when taking sertraline. Some of the most common ones include:

Tyramine-rich foods: The interaction between sertraline and tyramine-rich foods can lead to a sudden and potentially dangerous rise in blood pressure, clinically referred to as a hypertensive crisis. Tyramine, an amino acid derivative, is present in various food categories, including dairy, meat, and certain types of beans. Examples of tyramine-rich foods are:

• Bananas
• Pickles and olives
• Processed or cured meats (pepperoni and salami)
• Dried, smoked, or fermented fish
• Yeast extract
• Avocado

High-fat or greasy foods: This may reduce the effectiveness of Zoloft.

Grapefruit and grapefruit juice: Consuming grapefruit juice can elevate sertraline levels in the body, leading to heightened side effects and adverse reactions. Apart from grapefruit, other fruits may also interact with Zoloft. These fruits include:

• Apples
• Pomegranates
• Pomelos
• Cranberries
• Grapes

Alcohol: Consuming alcoholic beverages while taking Zoloft may result in increased feelings of depression or anxiety.

Caffeine: Coffee, tea, chocolate, and other items may naturally or artificially contain significant levels of caffeine. The main risk associated with increased caffeine intake is the potential for patients to experience dizziness, lightheadedness, or nausea.

Furthermore, substance use can heighten the risk of interactions. Patients should refrain from using illicit drugs, such as marijuana, cocaine, and heroin, as these substances can interact with Zoloft and result in harmful side effects.

Takeaway

Zoloft is an important medicine for treating different mental health issues like depression, anxiety, PTSD, and OCD. It works by affecting serotonin in the brain and is often chosen because it has few side effects.

Knowing the right dose and how to take Zoloft is important for getting the best results while staying safe. Patients and doctors should be aware of possible side effects and be cautious about other medicines or foods that could interact with Zoloft.

For those who don’t respond well to Zoloft or can’t tolerate it, there are other options available. With careful decision-making and working together with healthcare providers, patients can find the best treatment for them and improve their mental well-being and quality of life.

Frequently Asked Questions