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Isocarboxazid: Uses, Dosage, Side Effects, and Precautions

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Isocarboxazid is a monoamine oxidase inhibitor prescribed for the management of depression when other medications haven't worked.

Written byDr. Parvathi V

Medically reviewed byDr. Chibitam Hope Obia

Published At November 23, 2023
Reviewed AtMay 12, 2025

Introduction

Introduction Isocarboxazid is an MAOI (Monoamine oxidase inhibitor), which requires prescribing and dosing by a licensed prescriber. It is used in the protocol of managing depression after patients have failed trials of other antidepressant medications. MAOIs are considered to increase appropriate levels of intermediate neurotransmitters in the brain related to the patient's mood and emotional behavior, such as serotonin (5-HT), dopamine (DA), and norepinephrine (NE) in those brain areas referred to as the limbic system. Due to the drug overdose potential or excess dose of the MAOI medication, Isocarboxazid should only be used if all other approaches to treating the patient's depression are ineffective and have exhausted treatment options that have not worked. In addition, Isocarboxazid may only be administered with medical monitoring of the patient while currently and continuously supervised for drug interactions or drug/food interactions. Considering Isocarboxazid is a medication, it is contraindicated for the administration and consumption of food and medications that, in the event the patient were to eat a food that is precluded with the medication or take the precluded medication, would result in a significant potential of fundamental risk to the patient.

What Is Isocarboxazid?

Isocarboxazid is a prescription medication belonging to the monoamine oxidase inhibitor (MAOIs) drug class. MAOIs are primarily indicated for major depressive disorder (MDD) in severe, enduring depression, and may be considered if other options, such as selective serotonin receptor inhibitors (SSRIs) or serotonin norepinephrine reuptake inhibitors (SNRIs), are unsuccessful. Isocarboxazid works to increase levels in neurotransmitters, like serotonin, dopamine, and norepinephrine, that help to regulate mood and enhance emotional well-being.In contrast with newer antidepressants that are commonly used, such as SSRIs or SNRIs, isocarboxazid and other MAOIs are more often reserved for last resort, often due to warnings associated with pharmaceutical and dietary interactions. However, effective MAOIs can be in, specifically, in atypical depression (i.e., increased appetite, excessive sleep, extreme sensitivity to rejection). Along with depressive disorders, isocarboxazid can be prescribed for anxiety disorders, panic attacks, and other mood disorders when appropriate treatment has not yet achieved relief. Isocarboxazid achieves this by preventing the breakdown of important neurotransmitters that stabilize mood, increase motivation, and promote more positive overall mental health. When someone is using isocarboxazid, a strict diet must be followed, since eating foods with tyramine, such as aged cheeses, aged meats and fermented foods can cause hypertensive crises; isocarboxazid should also not be used with other antidepressants, medications that contain certain pain medications and stimulant medications, since using these medications can lead to serious and dangerous interactions, including serotonin syndrome and dramatic drops in blood pressure. Isocarboxazid remains an important alternative treatment for those suffering from treatment-resistant depression, providing an opportunity to recover and improve their quality of life following failed treatment with other medications.

What Is the Isocarboxazid Mechanism of Action?

The pharmacology mode of action of the medication Isocarboxazid is that it inactivates the monoamine oxidase (MAO) enzymes. MAO enzymes are responsible for degrading neurotransmitters like serotonin, dopamine, and norepinephrine. Therefore, when Isocarboxazid inactivates MAO, it raises those neurotransmitters, and thus possibly alleviates a person's symptoms of depression.

Isocarboxazid Uses

Isocarboxazid is usually given for major depressive disorder (MDD), often after other antidepressants, including selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs), have been ineffective. It tends to be effective when MDD includes atypical depression features (features could include mood reactivity (mood improves temporarily in response to positive situations), increased appetite, sleeping longer than usual, and a feeling of heaviness in the arm or legs (leaden paralysis)). The atypical features may lend themselves to its efficacy in cases where traditional antidepressants have not been effective. In addition to treating depressed mood, isocarboxazid may also be prescribed for anxiety disorders, panic disorders, and certain types of phobias. For example, some studies suggest isocarboxazid can reduce excessive nervousness in individuals suffering from social anxiety disorder (SAD), leading to increased overall confidence in social situations. Isocarboxazid can also be prescribed for dysthymia, a chronic and extended type of depression with less intense enterprise of feeling that happen for a much longer duration of time.

Isocarboxazid Dosage

The prescribed dose of isocarboxazid depends on the patient’s condition and the feedback he/she gives about the treatment. The initial dose is usually 10 mg two times a day. The doctor may order the dose to be increased in 10 mg increments every 2 to 4 days, to a maximum of 60 mg/day.

Patients should follow the physician's instructions. Otherwise, they might consume the wrong drugs and face a large number of side effects.

Missed Dose

In cases of missed doses, it is appropriate to take the next dose as soon as possible, and not to exceed the prescribed dose altogether, after the window elapsed, you will never double up on your dose, just take what was left with the next dose which is administered with food. The baby will not be given any medication or thyroid for at least one week after the extraction.

Isocarboxazid Overdose

In the event of an overdose of Isocarboxazid, it is a life-threatening event that can only be supervised by a physician. Some expected symptoms could include: fever, increased temperature, sad dreams, ringing in the ears, blood pressure, uncontrollable cramps, a feeling of nervousness, a production of insensitivity to external stimuli the event an overdose of Amphetamine is available, medical emergency services or local American poison will need to be called.

Isocarboxazid Interactions

Isocarboxazid can interact with many medications and cause serious side effects. Isocarboxazid will likely interact with: Other antidepressants.

SSRIs or SNRIs, MAOIs.

Pain Medications: Tramadol, Meperidine, or Fentanyl.

Decongestants: Pseudoephedrine or stimulant medications, such as Amphetamines.

Some blood pressure medications.

Some antipsychotics.

Consult a qualified healthcare provider before taking any medications while taking Isocarboxazid.

Isocarboxazid Caution and Consideration:

Patients should take caution with Isocarboxazid due to the potential serious side effects and risks. There are strict instructions on when taking Isocarboxazid in order for it to be safe and effective. One of the most important things to remember is not to suddenly stop taking the medication. Sudden discontinuation of Isocarboxazid could lead to withdraw symptoms of dizziness, irritability and mood changes, and nausea. If a patient is to discontinue Isocarboxazid, it should always be done with careful supervision of the prescribing physician. The physician will be able to taper the dosage down over time. Regularly monitoring the patient's blood pressure is likely going to be important. Isocarboxazid can cause a serious elevation in blood pressure and should be avoided with a patient that is not compliant with contraindicated foods. Patients taking Isocarboxazid must avoid Tyramine and, specifically, food that is aged, fermented or cured meats. Not to mention, patients taking Isocarboxazid should also be cautious with over-the-counter medications (especially if it is a stimulant or decongestant) as they could also amplify the increase in blood pressure, again, when taking the medication. While taking Isocarboxazid, the patient should limit or completely avoid alcohol as it could amplify adverse effects such as sedation, dizziness or confusion.

Finally, Isocarboxazid could also impair judgment and coordination while the patient is taking Isocarboxazid, therefore, while taking this medication the patient should never drive or engage in other activities requiring coordination vigilance until they know how the medication will affect them.

Isocarboxazid Contraindications

Certain categories of individuals should not use Isocarboxazid. Contraindications for Isocarboxazid include patients who have:

  • Pheochromocytoma, a rare tumor of the adrenal gland.

  • Severe liver disease.

  • Other MAOIs, SSRIs, or SNRIs.

  • A history of malignancy and/or history of cerebral vascular disease and/or uncontrolled hypertension.

  • Pregnant and/or nursing women, unless the patient has been discussed with their physician.

Isocarboxazid Foods to Avoid

Undeniably alarming when taking monoamine oxidase inhibitors (MAO), such as isocarboxazid, is the possible risk associated with food that may contain high amounts of tyramine. A food interaction or drug-food interaction can lead to a hypertensive crisis, which is extremely dangerous. Increase in blood pressure manifested as headaches, nausea, chest pain, and, ultimately, stroke or heart failure. Unquestionably, patients experiencing this situation have to carefully consider what foods they will eat.

Food to Avoid Includes: Aged cheeses - Cheddar, blue cheese, parmesan, gouda, and Swiss are all tyramine-rich cheeses.

Cured and Processed Meats - Salami, pepperoni, hot dogs, bacon, and smoked fish are all avoided.

Fermented and Pickled Foods - Kimchi, miso, sauerkraut, soy and tofu are also all considered tyramine-rich foods.

Alcoholic Beverages - Red wine, beer (especially if it is draft beer), and even some liquors can increase blood pressure to a severely dangerous level.

Finally, consume overripe or aged fruit such as overripe bananas, avocados, and dried fruits like raisins with caution. When taking isocarboxazid, it is important to read labels carefully and to talk to your physician and/or dietitian about any possible dietary risk associated with any food products you may eat. To be safe when on isocarboxazid, you should avoid potentially serious and life-threatening side effects by eating fresh food that is minimally processed.

Storage

Appropriate storage conditions for isocarboxazid is essential to ensure the medication’s effectiveness:-

  • Room temperature (15-30 degrees Celsius) is acceptable.

  • Store in a dry location protected from moisture/humidity.

  • Store out of sight and out of reach of small children.

  • Your community pharmacy or local disposal system will accept expired/unneeded medication.

Conclusion

Isocarboxazid is a strong antidepressant that will require monitoring and compliance with dietary restrictions. Isocarboxazid may be beneficial for patients diagnosed as having treatment-resistant depression, however, patients taking isocarboxazid will be required to take their prescribed amount, avoid contraindicated foods and medications, and be aware of possible interactions. Safe assessments for the treatment plan are very important for ongoing and routine medical management and oversight for the safety of the patient and the effectiveness of the treatment plan. If side effects emerge, be sure to obtain medical attention immediately. If you have any questions or uncertainties, it is best to work with your medical provider to help decide if this will be an appropriate medication to help with your depression symptom management.

Key Takeaway/Note from iCliniq

For personalized guidance and to remove confusion regarding Isocarboxazid, visit iCliniq doctors today for professional advice.

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