Citalopram 20mg Tablets
Overview
What is this medicine?
How to Use This Medicine
To use this medication correctly, follow your doctor's instructions and read all the information provided. Take your medication as directed, with or without food. Continue taking it even if you feel well, unless your doctor or healthcare provider advises you to stop.
Storing and Disposing of Your Medication
Store your medication at room temperature in a dry place, avoiding the bathroom. Keep all medications in a safe location, out of reach of children and pets. Dispose of unused or expired medications properly. Do not flush them down the toilet or pour them down the drain unless instructed to do so. If you have questions about disposal, consult your pharmacist. You may also want to check if there are drug take-back programs available in your area.
Missing a Dose
If you miss a dose, take it as soon as you remember. However, if it's close to the time for your next dose, skip the missed dose and resume your regular schedule. Do not take two doses at the same time or take extra doses to make up for the missed one.
Lifestyle & Tips
- Take exactly as prescribed, usually once daily, with or without food.
- Do not stop taking citalopram suddenly, as this can cause withdrawal symptoms. Your doctor will guide you on how to slowly reduce the dose if needed.
- Avoid alcohol while taking citalopram, as it can worsen side effects like drowsiness.
- Be cautious when driving or operating machinery until you know how this medication affects you, as it may cause dizziness or drowsiness.
- Report any unusual changes in mood or behavior, especially during the first few weeks of treatment or after a dose change.
- Inform your doctor and pharmacist about all other medications, supplements, and herbal products you are taking to avoid potential drug interactions.
Available Forms & Alternatives
Dosing & Administration
Adult Dosing
Condition-Specific Dosing:
Pediatric Dosing
Dose Adjustments
Renal Impairment:
Hepatic Impairment:
Pharmacology
Mechanism of Action
Pharmacokinetics
Absorption:
Distribution:
Elimination:
Pharmacodynamics
Safety & Warnings
BLACK BOX WARNING
Side Effects
Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor immediately or seek emergency medical attention:
Signs of an allergic reaction: rash, hives, itching, red, swollen, blistered, or peeling skin (with or without fever), wheezing, tightness in the chest or throat, trouble breathing, swallowing, or talking, unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat
Signs of low sodium levels: headache, trouble focusing, memory problems, feeling confused, weakness, seizures, or changes in balance
Signs of bleeding: vomiting or coughing up blood, vomit that looks like coffee grounds, blood in the urine, black, red, or tarry stools, bleeding from the gums, abnormal vaginal bleeding, unexplained bruises or bruises that get bigger, or bleeding that won't stop
Chest pain or pressure
Fast, slow, or irregular heartbeat
Shortness of breath
Dizziness or fainting
Seizures
Unexplained weight changes
Painful or prolonged erections (lasting more than 4 hours)
Changes in menstrual periods
Sex problems, including decreased interest in sex, trouble having an orgasm, ejaculation problems, or difficulty getting or maintaining an erection
Additionally, a rare but potentially life-threatening condition called serotonin syndrome may occur, especially if you're taking other medications. Seek medical help immediately if you experience:
Agitation
Changes in balance
Confusion
Hallucinations
Fever
Fast or irregular heartbeat
Flushing
Muscle twitching or stiffness
Seizures
Shivering or shaking
Excessive sweating
Severe diarrhea, stomach upset, or vomiting
Severe headache
Other Possible Side Effects
Most people don't experience severe side effects, but some may occur. If you notice any of the following symptoms, contact your doctor if they bother you or don't go away:
Dizziness, drowsiness, fatigue, or weakness
Dry mouth
Constipation, diarrhea, stomach upset, vomiting, or decreased appetite
Trouble sleeping
Shakiness
Excessive sweating
Yawning
* Symptoms of a common cold
This is not an exhaustive list of possible side effects. If you have questions or concerns, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
Seek Immediate Medical Attention If You Experience:
- Worsening depression or anxiety
- New or worsening thoughts of self-harm or suicide
- Unusual changes in behavior (e.g., agitation, restlessness, panic attacks, irritability, aggression, impulsivity, severe restlessness, hypomania, mania)
- Symptoms of Serotonin Syndrome: fast heartbeat, sweating, muscle stiffness or spasms, fever, confusion, severe diarrhea, agitation, hallucinations.
- Symptoms of Hyponatremia (low sodium): headache, confusion, weakness, unsteadiness, memory problems, seizures.
- Unusual bleeding or bruising.
- Allergic reaction (rash, itching/swelling, severe dizziness, trouble breathing).
Before Using This Medicine
It is essential to inform your doctor about the following:
Any allergies you have, including allergies to this medication, its components, or other substances. Be sure to describe the allergic reaction and its symptoms.
Certain heart conditions, such as:
+ Long QTc on an electrocardiogram (ECG) or other abnormal heart rhythms
+ Slow heartbeat
+ Low potassium or magnesium levels
A history of heart failure (weak heart) or a recent heart attack
Current or recent use of specific medications, including:
+ Linezolid or methylene blue
+ Escitalopram or pimozide
+ Any medications that can cause abnormal heart rhythms (prolonged QT interval). There are many medications that can have this effect, so it's crucial to ask your doctor or pharmacist if you're unsure.
Use of certain medications for depression or Parkinson's disease within the last 14 days, such as:
+ Isocarboxazid
+ Phenelzine
+ Tranylcypromine
+ Selegiline
+ Rasagiline (note: taking these medications with this drug can lead to very high blood pressure)
This is not an exhaustive list of all potential interactions. Therefore, it is vital to inform your doctor and pharmacist about all your medications, including:
Prescription and over-the-counter (OTC) medications
Natural products
Vitamins
Your doctor needs to verify that it is safe for you to take this medication with all your current medications and health conditions. Do not start, stop, or change the dose of any medication without consulting your doctor first.
Precautions & Cautions
If you are taking this medication, it is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, about your treatment.
Precautions and Safety Measures
Avoid driving and engaging in activities that require alertness until you understand how this medication affects you.
Do not stop taking this medication abruptly without consulting your doctor, as this may increase the risk of side effects. If you need to discontinue the medication, your doctor will guide you on how to gradually stop taking it.
This medication can cause abnormal heart rhythms (long QT on ECG), which may lead to sudden death. Discuss this risk with your doctor.
Avoid consuming alcohol while taking this medication.
Before using marijuana, cannabis, or prescription/over-the-counter medications that may impair your actions, consult your doctor.
Depression Treatment and Response
When treating depression, you may experience improvements in sleep and appetite soon after starting this medication. However, other symptoms of depression may take up to 4 weeks to show significant improvement.
Potential Risks and Side Effects
This medication may increase the risk of bleeding, which can be life-threatening in some cases. Discuss this risk with your doctor.
Certain individuals may be more prone to eye problems while taking this medication. Your doctor may recommend an eye exam to assess your risk. If you experience eye pain, changes in vision, or swelling/redness in or around the eye, contact your doctor immediately.
This medication can cause low sodium levels, which can be life-threatening and lead to seizures, loss of consciousness, breathing difficulties, or death.
If you are 60 years or older, use this medication with caution, as you may be more susceptible to side effects.
Special Considerations
If you are pregnant, plan to become pregnant, or are breastfeeding, inform your doctor. You will need to discuss the benefits and risks of taking this medication during pregnancy or breastfeeding.
Taking this medication in the third trimester of pregnancy may increase the risk of bleeding after delivery and potentially cause health problems in the newborn.
Breastfeeding mothers should discuss the potential risks to their baby with their doctor.
Pediatric Considerations
This medication may affect growth in children and adolescents. Regular growth checks may be necessary. Consult your doctor to discuss the potential risks and benefits for your child.
Overdose Information
Overdose Symptoms:
- Dizziness
- Sweating
- Nausea
- Vomiting
- Tremor
- Somnolence
- Sinus tachycardia
- Bradycardia
- QTc prolongation
- Arrhythmias (e.g., Torsade de Pointes)
- Convulsions
- Coma
- Hypotension
- Rhabdomyolysis
What to Do:
Seek immediate medical attention or call 911. For poison control, call 1-800-222-1222. Treatment is generally supportive and symptomatic. Activated charcoal may be considered if ingested recently. Monitor cardiac rhythm (ECG) and vital signs closely.
Drug Interactions
Contraindicated Interactions
- Monoamine Oxidase Inhibitors (MAOIs) (risk of serotonin syndrome)
- Pimozide (risk of QTc prolongation)
Major Interactions
- Other serotonergic drugs (e.g., triptans, tricyclic antidepressants, fentanyl, lithium, tramadol, tryptophan, buspirone, St. John's Wort) (risk of serotonin syndrome)
- Drugs that prolong the QTc interval (e.g., Class IA and III antiarrhythmics, antipsychotics, macrolide antibiotics, fluoroquinolone antibiotics) (additive QTc prolongation)
- Anticoagulants (e.g., warfarin) and antiplatelet agents (e.g., NSAIDs, aspirin) (increased risk of bleeding)
- Linezolid (MAOI activity, risk of serotonin syndrome)
Moderate Interactions
- CYP2C19 inhibitors (e.g., omeprazole, esomeprazole, fluoxetine, fluvoxamine, lansoprazole, ticlopidine) (may increase citalopram levels)
- CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, clarithromycin, ritonavir) (may increase citalopram levels)
- Alcohol (additive CNS depression, though specific interaction not well-defined)
Minor Interactions
- Drugs metabolized by CYP2D6 (e.g., metoprolol, desipramine) (citalopram is a weak inhibitor, potential for minor increase in levels)
Monitoring
Baseline Monitoring
Rationale: To establish baseline symptoms and assess severity of depression/anxiety.
Timing: Prior to initiation of therapy.
Rationale: To assess baseline QTc interval, especially in patients with pre-existing cardiac conditions, family history of prolonged QT, or on other QTc-prolonging medications.
Timing: Prior to initiation, particularly if risk factors for QTc prolongation are present.
Rationale: To establish baseline, especially in elderly or those at risk for hyponatremia.
Timing: Prior to initiation.
Rationale: To guide dosing adjustments in patients with impairment.
Timing: Prior to initiation.
Routine Monitoring
Frequency: Weekly for first 4-6 weeks, then periodically (e.g., monthly) or as clinically indicated.
Target: Improvement in mood, reduction in anxiety, resolution of target symptoms.
Action Threshold: Lack of improvement, worsening symptoms, or intolerable side effects may warrant dose adjustment or change in therapy.
Frequency: Especially during initial treatment and dose changes, then periodically.
Target: Absence of suicidal thoughts or behaviors.
Action Threshold: Any emergence or worsening of suicidal thoughts/behaviors requires immediate clinical assessment and intervention.
Frequency: Periodically, especially if dose is increased to 40 mg/day, or if new QTc-prolonging medications are added, or if patient develops symptoms of arrhythmia.
Target: < 450 ms (men), < 470 ms (women); avoid if QTc > 500 ms.
Action Threshold: QTc prolongation > 500 ms or increase > 60 ms from baseline warrants dose reduction or discontinuation.
Frequency: Periodically, especially in elderly, those on diuretics, or with symptoms of hyponatremia.
Target: 135-145 mEq/L
Action Threshold: Sodium < 135 mEq/L (hyponatremia) requires investigation and potential discontinuation.
Symptom Monitoring
- Worsening depression
- Anxiety
- Agitation
- Panic attacks
- Insomnia
- Irritability
- Hostility
- Impulsivity
- Akathisia (psychomotor restlessness)
- Hypomania/mania
- Suicidal ideation or behavior
- Symptoms of Serotonin Syndrome (e.g., agitation, hallucinations, rapid heart beat, fever, sweating, muscle rigidity, tremor, nausea, vomiting, diarrhea)
- Symptoms of Hyponatremia (e.g., headache, difficulty concentrating, memory impairment, confusion, weakness, unsteadiness, seizures)
- Unusual bleeding or bruising
Special Patient Groups
Pregnancy
Category C. Use during pregnancy only if the potential benefit justifies the potential risk to the fetus. Exposure during late pregnancy may be associated with complications in the neonate requiring prolonged hospitalization, respiratory support, and tube feeding (Persistent Pulmonary Hypertension of the Newborn - PPHN).
Trimester-Specific Risks:
Lactation
Citalopram is excreted into breast milk. The American Academy of Pediatrics considers citalopram to be compatible with breastfeeding. However, monitor the infant for adverse effects such as sedation, poor feeding, and weight gain.
Pediatric Use
Not approved for use in pediatric patients for Major Depressive Disorder due to increased risk of suicidal thoughts and behavior (Black Box Warning). Safety and efficacy have not been established.
Geriatric Use
Lower starting dose (10 mg/day) and maximum dose (20 mg/day) are recommended due to decreased clearance and increased risk of adverse effects, particularly QTc prolongation and hyponatremia. Monitor closely for side effects.
Clinical Information
Clinical Pearls
- Citalopram has a dose-dependent risk of QTc prolongation. The maximum recommended dose is 40 mg/day for most adults and 20 mg/day for patients over 60 years of age, those with hepatic impairment, or those who are CYP2C19 poor metabolizers.
- Patients should be advised not to abruptly discontinue citalopram to avoid withdrawal symptoms (e.g., dizziness, sensory disturbances, sleep disturbances, agitation, anxiety, nausea, tremor, sweating). Tapering should be gradual.
- Monitor for signs and symptoms of serotonin syndrome, especially when co-administered with other serotonergic agents.
- Hyponatremia (low sodium) can occur, particularly in elderly patients, those taking diuretics, or those who are volume-depleted. Monitor sodium levels if risk factors are present or symptoms develop.
- Clinical improvement may take several weeks. Patients should be encouraged to continue treatment as prescribed even if immediate effects are not felt.
Alternative Therapies
- Other Selective Serotonin Reuptake Inhibitors (SSRIs): Sertraline, Fluoxetine, Paroxetine, Escitalopram, Fluvoxamine
- Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs): Venlafaxine, Duloxetine, Desvenlafaxine
- Atypical Antidepressants: Bupropion, Mirtazapine, Trazodone, Vortioxetine, Vilazodone
- Tricyclic Antidepressants (TCAs): Amitriptyline, Nortriptyline, Imipramine
- Monoamine Oxidase Inhibitors (MAOIs): Phenelzine, Tranylcypromine (reserved for refractory cases)
- Psychotherapy (e.g., Cognitive Behavioral Therapy - CBT)
- Electroconvulsive Therapy (ECT) for severe, refractory depression
Cost & Coverage
General Drug Facts
This medication is accompanied by a Medication Guide, which is a valuable resource that provides important information about your treatment. Please read this guide carefully and review it again each time your prescription is refilled. If you have any questions or concerns about your medication, do not hesitate to consult with your doctor, pharmacist, or other healthcare provider.
In the event of a suspected overdose, immediately call your local poison control center or seek emergency medical attention. When seeking help, be prepared to provide detailed information about the overdose, including the name of the medication, the amount taken, and the time it occurred.