Marplan (isocarboxazid) is a type of antidepressant for people who haven’t experienced symptom relief from other antidepressants.
If you’re thinking about trying Marplan, talk to an online healthcare provider on Klarity Health. If they think Marplan is right for you, they can send a prescription straight to your online or local pharmacy.
Providers on Klarity Health are independent practitioners with clinical autonomy; a diagnosis, treatment, or prescription is not guaranteed.
Providers on Klarity Health are independent practitioners with clinical autonomy; a diagnosis, treatment, or prescription is not guaranteed.
Marplan (isocarboxazid) is a monoamine oxidase inhibitor (MAOI). It was approved by the U.S. Food and Drug Administration (FDA) in 1998 to treat depression. It may also help with anxiety. Marplan is the brand name of isocarboxazid. There’s currently no generic version of Marplan available in the U.S.
Marplan comes as a tablet. It’s commonly used for managing symptoms of depression in cases where other treatments haven’t worked. In one study, individuals who had used selective serotonin reuptake inhibitors (SSRIs) were 1.8 times more likely to get isocarboxazid, and those who had used serotonin-norepinephrine reuptake inhibitors (SNRIs) were 4.9 times more likely to be prescribed isocarboxazid.
Another study reported that isocarboxazid was more effective in treating major depression than minor, especially if the depression was endogenous, meaning it resulted from an internal cause instead of an external one.
And participants in trials that evaluated Marplan’s effectiveness had both major depressive disorder (MDD) and signs and symptoms of anxiety. So it may offer relief for comorbid depression and anxiety.
Marplan works by blocking 2 types of monoamine oxidase (specifically, MAO-A and MAO-B). These enzymes break down neurotransmitters like serotonin, norepinephrine, and dopamine in the brain. By preventing this breakdown, Marplan raises the levels of these neurotransmitters, which can alleviate depressive symptoms. Higher levels of serotonin, norepinephrine, and dopamine are thought to improve mood, emotional processing, and mental focus.
It can take 3 to 4 weeks before you start to feel Marplan’s effects. A clinical trial reported that 92% of individuals taking Marplan experienced significant symptom improvement of anxiety at week 3 of treatment and depression at week 4.
and up. It’s usually not the first choice of medication in individuals newly diagnosed with depression due to the potential for serious side effects. It’s most commonly prescribed when other antidepressants haven’t worked.
Marplan is sometimes prescribed off-label, meaning used for something it’s not FDA-approved for, for anxiety and panic associated with depression.
To start treatment with Marplan, you need a treatment plan and prescription from a licensed healthcare provider. This can include medical professionals, such as nurse practitioners (NPs) or psychiatric nurse practitioners (MHNPs), physician assistants/associates (PAs), or medical doctors (MDs) including psychiatrists, who can assess your symptoms and decide if Marplan is a medically necessary part of a depression treatment plan for you.
You can schedule an appointment with a caring, board-certified provider on Klarity Health to discuss your mental health care options, which may include medications like Marplan. If your provider thinks Marplan is right for you, they can send it directly to your chosen local or online pharmacy. Keep in mind that some states may require at least one in-person consultation before a prescription can be issued. To understand the specific regulations in your area, see the Center for Connected Health Policy’s website for details.
Marplan is available in 10-milligram tablets. The starting dose is 20 milligrams a day, taken in 2 10-milligram doses. If your body tolerates this, your doctor will increase your dose by one 10-milligram tablet every 2 to 4 days. The goal is to reach 4 10-milligram tablets (40 milligrams) daily by the end of the first week. After that, your dose can be increased by up to 20 milligrams per week if necessary, depending on how well you tolerate it, with a maximum dosage of 60 milligrams per day. The daily dose should always be divided into 2 to 4 doses.
It can take 3 to 6 weeks for Marplan to be fully effective. And once you’ve experienced the most symptom improvement possible, your provider will have you slowly decrease your dose over a period of several weeks to the lowest dose possible that doesn’t reduce the effectiveness of your treatment. If you don’t see any symptom improvement in 6 weeks, your doctor may recommend discontinuing Marplan.
Some common side effects of Marplan include anxiety, chills, forgetfulness, hyperactivity, lethargy, sedation, syncope (fainting), dizziness, sweating, a heavy feeling in the muscles, orthostatic hypotension (a blood pressure drop when rising from sitting), heart palpitations, dry mouth, constipation, nausea, diarrhea, impotence, urinary frequency, urinary hesitancy, headache, insomnia, sleep disturbance, tremors, myoclonic jerks (sudden and involuntary muscle movements), and paresthesia (abnormal skin sensations).
Marplan also has some serious side effects, like hypotension (low blood pressure), lower seizure threshold, suicidal thoughts, and hepatotoxicity (liver damage). These side effects require immediate medical attention. Marplan also carries an FDA-boxed warning for increased risk of suicidal thoughts and behaviors in children, adolescents, and young adults.
Marplan has contraindications with certain health conditions and should be used with caution in individuals with impaired renal function or hyperthyroid diabetics using insulin or glycemic agents and individuals with hyperactivity, agitation, or schizophrenia.
Individuals taking Antabuse (disulfiram), a drug for alcohol or substance abuse, should use Marplan with caution. Because of drug interactions, it shouldn’t be used with other psychotropic agents or other MAO inhibitors, tricyclic medications (dibenzazepine-related and others), Wellbutrin (bupropion), SSRI antidepressants, Buspar (buspirone), sympathomimetic drugs including amphetamines and over-the-counter cold, hay fever or weight-reducing preparations containing vasoconstrictors (decongestants), tryptophan, Demerol (meperidine), dextromethorphan, anesthetic agents, blood pressure drugs, including thiazide diuretics, or central nervous system (CNS) depressants, such as narcotics, barbiturates, and alcohol.
To prevent the possibility of dangerously high blood pressure, Marplan shouldn’t be taken with certain foods, including foods high in caffeine or tyramine, such as aged or strong cheeses, cured or processed meats, avocados, sauerkraut, pickled or fermented foods, dried fruits, and others.
If you take Marplan and have any side effects, work with your provider and consider reporting negative side effects to the FDA by visiting MedWatch or calling 1-800-FDA-1088.
According to drugs.com, with its discount, the cost of 100 10-milligram tablets of Marplan is $531.51.
The maker of Marplan, Validus Pharmaceuticals LLC, offers a savings plan that lets eligible people pay as little as $20 and save $100, $150, or $200 on their co-pay for a 30-, 60-, or 90-day prescription. You can also save up to 80% with a prescription or drug discount card from SingleCare Rx, NeedyMeds, drugs.com, GoodRx, WellRx, or other providers, whether or not you have insurance.
Newer antidepressants, like SSRIs, such as Zoloft (sertraline), Lexapro (escitalopram), or Prozac (fluoxetine), or norepinephrine-dopamine reuptake inhibitors (NDRIs) like Wellbutrin (bupropion) are often prescribed for depression before Marplan because they have fewer side effects, no food restrictions and fewer drug interactions in the case of SSRIs, making Marplan a “second-line” treatment for depression.
Marplan is especially effective for people who didn’t respond to other treatments because it works in multiple ways, whereas SSRIs only work in 1 way. SSRIs only prevent serotonin reuptake to increase serotonin levels in the brain. MAOIs block monoamines to prevent the breakdown of serotonin, norepinephrine, and dopamine — making all 3 more available.
A clinical review reported that while SSRIs have fewer side effects, they can be slower to work and less effective for the physical symptoms associated with depression when compared to MAOIs.
Tricyclic antidepressants, like amitriptyline, may be less effective than MAOIs for early-stage treatment-resistant depression. A study reported that MAOIs were more effective than TCAs, with significantly better end-of-treatment scores.
Atypical antipsychotics, like Rexulti (brexpiprazole), are sometimes prescribed for treatment-resistant depression. Rexulti works by helping balance serotonin and dopamine in the brain. It’s a partial agonist that binds to receptors in the brain and activates them, but not all the way. Unlike SSRIs, it adapts to the brain’s needs, stimulating receptors if there’s a deficit or dampening them if there is too much. Unlike Marplan, which is often used alone, Rexulti is frequently used in combination with medications to treat depression.
Zoloft, Lexapro, Prozac, and Wellbutrin are approved for major depressive disorder (MDD), while Zoloft and Prozac are also approved for OCD and panic disorder. Wellbutrin is additionally approved for seasonal affective disorder (SAD) and smoking cessation. Rexulti and Prozac are approved for adjunctive treatment (alongside another medication) for depression. Zoloft and Lexapro are both approved for anxiety-related conditions, including generalized anxiety disorder (GAD) and social anxiety disorder. Rexulti is approved for schizophrenia, while amitriptyline is approved for depression but is commonly used off-label for chronic pain, migraines, and insomnia.
Zoloft, Lexapro, Prozac, Rexulti, amitriptyline, and Wellbutrin can cause side effects, some of which may be serious. Possible side effects include, but aren’t limited to, restlessness, nausea, dizziness, sexual dysfunction, dry mouth, fatigue, constipation, insomnia, sweating, blurred vision, headache, and weight changes.
The best way to find out which mental health medication, if any, is best for you, is to talk to a licensed healthcare provider.
Licensed medical professionals on Klarity Health will work with you to create a depression treatment plan tailored to you, including medication prescriptions if medically necessary, behavioral counseling or therapy, or skills training.
Use: FDA-approved medication for Major Depressive Disorder (MDD).
Wellbutrin (bupropion)
Use: FDA-approved medication for Major Depressive Disorder (MDD).
Zoloft (sertraline)
Use: FDA-approved medication for Major Depressive Disorder (MDD).
Pristiq (desvenlafaxine)
Use: FDA-approved medication for Major Depressive Disorder (MDD).
Reviews from real patients who received treatment from healthcare providers on Klarity Health.
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*Appointments are generally available within 24 hours. Free initial consultations are available only with select providers. Prescriptions, particularly for controlled substances, may require an in-person evaluation depending on the state of residence and current federal regulations.
The information provided in this article is for educational purposes only and should not be construed as medical advice. Controlled substances may not be appropriate for all patients and any mention of these medications is for educational purposes only, not for marketing or encouraging self-diagnosis. Always seek the guidance of a qualified healthcare professional with any questions or concerns you have regarding your health. Providers on Klarity Health are independent practitioners with clinical autonomy. Nothing in this article is intended to diagnose or treat any condition, including guaranteeing prescription medication of any kind or dosage. Not all providers on Klarity Health prescribe all medications, particularly medications that are controlled substances.
If you’re having a mental health crisis or experiencing a psychiatric emergency, it’s crucial to seek immediate help from a mental healthcare professional, such as a psychiatrist, psychologist, or therapist. You can also call your local emergency services, visit your nearest emergency room, or contact a crisis hotline, such as the National Suicide Prevention Lifeline, by calling or texting 988 or dialing the Lifeline’s previous phone number, 1-800-273-TALK (1-800-273-8255) in the U.S.