Celexa is the brand name of a prescription antidepressant belonging to a family of drugs called selective serotonin reuptake inhibitors (SSRIs).
Like other SSRIs, Celexa works by increasing levels of a brain chemical called serotonin, which is linked to mood, sleep regulation and emotions. Celexa is approved for the treatment of major depression, but is also used off-label to treat anxiety disorders, obsessive-compulsive disorder, eating disorders and diabetic neuropathy.
Patients who use Celexa can begin to see significant changes in their mood after several weeks. Doctors generally expect to see remission in a patient’s depression after a couple of months.
After it was introduced in 1998, Celexa quickly became one of the most widely used antidepressants in the U.S., with more than 16 million prescriptions written each year. While it is still prescribed today, generic versions of the drug (citalopram) and the introduction of Lexapro saw use and sales of Celexa decline significantly.
Differences Between Celexa and Lexapro
Forest Laboratories manufactures and markets Celexa and Lexapro. Generic versions of both medications became available after the brand name patents expired in 2003 and 2012, respectively.
In 2002 — a year before Celexa’s patent expired — Forest introduced Lexapro with the goal of better tolerability.
The recommended initial dose of Celexa is 20 mg daily, with an increase to a maximum dose of 40 mg each day. This is twice the recommended dose of Lexapro.
Other differences between Celexa and Lexapro include:
- Chemical Makeup: While similar in chemical structure, Celexa was produced as a racemate, meaning it is a mixture of two stereoisomers — R-citalopram and S-citalopram. Lexapro is composed of only S-citalopram.
- Selectivity: Both are among the most selective of the SSRI class. In pharmacology, selectivity means the degree to which a dose of a drug produces the desired effect in relation to side effects. In addition to being a serotonin reuptake inhibitor, Celexa is also a mild inhibitor of histamine 1 receptors, which are expressed in the heart, smooth muscles, on vascular endothelial cells and in the central nervous system.
- Treatment Uses: Both are used for depression, but Lexapro is also approved for generalized anxiety disorder.
- Prescriptions for Children: Celexa is not approved for use in children, while Lexapro is approved to treat depression in adolescents 12 or older.
Perhaps the most significant difference between the two drugs is a potentially adverse heart condition. Celexa is linked to QT prolongation-—a heart rhythm disorder that can potentially cause serious irregular heartbeats. This risk is the main reason for the maximum dosage limit of 40 mg per day, according the FDA label for the drug.
In 2012, the FDA said that Celexa is not recommended at doses greater than 20 mg a day in patients older than 60 years.
How Long Should Someone Take Celexa?
According to controlled trials, Celexa is effective in maintaining an antidepressant response for up to 24 weeks following six to eight weeks of acute treatment. It may take several weeks before symptoms improve.
However, doctors who prescribe Celexa should carefully monitor patients on the usefulness of the drug on an individual basis.
Suddenly stopping use can result in withdrawal symptoms, including:
- Dysphoria (profound state of unease or dissatisfaction)
- Sensory disturbances
Patients should be monitored for these symptoms when discontinuing treatment. A gradual dose reduction may prevent or lessen the severity of withdrawal symptoms.
Celexa is not considered an addictive antidepressant. However, some patients may abuse the drug by trying to elevate their mood and get high from taking more than the recommended dosage.
Physicians should carefully evaluate patients with a history of drug abuse and monitor them for signs of abuse or misuse.
Common Side Effects of Celexa
The most common side effects of Celexa are nausea and vomiting, increase sweating, dry mouth and headaches. Insomnia and somnolence (drowsiness) are also common, appearing in 15 percent or more of patients in placebo-controlled clinical trials.
These side effects are more likely with higher doses, and side effects such as nausea, insomnia and drowsiness are likely to go away once the body adjusts to the medication. Like other SSRIs, men who take Celexa may experience abnormal ejaculation, a decreased libido and erectile dysfunction (impotence).
Celexa is not recommended for patients with heart conditions, low blood sugar (hypoglycemia) or low magnesium in the blood (hypomagnesemia).
Black-Box Suicide Warning
While Celexa is only approved by the FDA to treat depression in adults, doctors may prescribe it to adolescents as an off-label use.
But this comes with its own set of risks. Like other SSRIs, Celexa carries a black-box warning for an increased risk of suicide. Black-box warnings are the strictest warnings put on prescription drugs by the FDA, and they are utilized when there is reasonable evidence of a serious hazard.
SSRIs, including Celexa, increased the risk of suicidal thoughts and behaviors in children, adolescents and young adults in short-term studies of major depressive disorder and other mental disorders.
Risks were highest among patients younger than 18, with 14 additional cases of suicidal thoughts or behaviors compared to a placebo-controlled group.
Patients 25 and over taking Celexa saw one fewer case of suicidal thoughts or behaviors in the clinical trials, while patients 65 and older saw an even greater reduction in suicide risk, with six fewer cases.
Suicide is a known risk factor of depression and other mental disorders.
FDA Warns of Heart Conditions Related to Celexa
In 2012, the FDA revised health warnings about Celexa regarding the drug’s potential to disrupt normal heart function, especially in those taking higher dosages. Labels are now marked to warn people with heart conditions of this possibility.
Celexa increases the risk of Long QT syndrome, a condition that can lead to an abnormal heart rhythm condition called Torsade de Pointes, which can be fatal.
The FDA revision noted that any dose of Celexa or generic forms of the drug is not recommended for certain patients because of the QT prolongation risk. But because it may still be beneficial for some of these people to use Celexa, the agency changed the label to specifically caution these patients.
Label changes include:
- Recommending discontinuation of Celexa in patients with persistent QTc measurements greater than 500 milliseconds. QT intervals measure the amount of time between waves of the heart’s electrical cycle.
- ECG monitoring in Celexa patients at high risk of QT prolongation.
- The maximum recommended dose of 20 mg per day for patients 60 years of age or older.
In the label revisions, the FDA advises patients currently taking a dose greater than 40 mg per day to consult their health care professional and to seek immediate care if they experience an irregular heartbeat, shortness of breath, dizziness or fainting while taking Celexa.
Other Potential Serious Side Effects of Celexa
Studies link Celexa and other SSRIs to an increased risk of autism and several birth defects when taken during pregnancy.
Despite this, some doctors continue to prescribe Celexa to pregnant women, believing that untreated maternal depression could have even more serious effects.
Other potential side effects associated with Celexa that may require emergency medical attention include:
Link to Autism
Celexa and other SSRIs are now linked to an increased risk of autism, according to a 2015 JAMA Pediatrics study. Mothers who took Celexa or other SSRIs have a 200 percent increase in risk, especially when taken during the second and third trimesters.
Celexa and Birth Defects
Celexa and most other SSRIs fall under Class C pregnancy risk, which means they have shown harm to animal fetuses but there are insufficient studies of damage to human fetuses. Experts believe the risk of birth defects is low when women take Celexa while pregnant.
First-trimester usage of SSRIs is linked to a slight increase in the risk of miscarriage. Studies also suggest that women who take SSRIs during that window may experience premature delivery or a baby with low birth weight. Late-pregnancy SSRI use can lead to withdrawal symptoms in the baby, including seizures, feeding difficulty and behavioral problems like constant crying. These symptoms are typically short-lived.
This potentially fatal condition occurs when too much serotonin exists in the brain. This generally occurs when two drugs that increase serotonin levels are taken together. Symptoms can include changes in mental condition (agitation or hallucinations), coma, muscle twitching, racing heartbeat, changes in blood pressure, fever, nausea or diarrhea, and stiff muscles.
Celexa patients taking Monoamine oxidase inhibitors (MAOIs) have an increased risk of serotonin syndrome.
Severe Allergic Reaction
People allergic to Celexa may experience trouble breathing, facial swelling, or itchy welts or hives, accompanied by a fever and joint pain. People who have allergic reactions to Celexa should seek medical attention right away.