Ozanimod: An Efficient Drug for Relapsing Forms of Multiple Sclerosis?

Introduction:

An immunomodulatory drug called Ozanimod is used to treat relapse forms of multiple sclerosis (MS). Ozanimod, a member of the sphingosine-1-phosphate (S1P) receptor modulator class, reduces inflammation and autoimmune responses by modifying the immune system. It inhibits the migration of certain immune cells into the central nervous system by binding to S1P receptors on these cells. This lowers the frequency of relapses, slows the course of disability, and reduces the number of new brain lesions in MS patients. The Food and Drug Administration (FDA) approved Ozanimod on March 26th, 2020.

Indications of Ozanimod

The main purpose of Ozanimod is to treat the symptoms of multiple sclerosis, especially the relapse types of multiple sclerosis.

Among these signs are:

• Relapsing-Remitting Multiple Sclerosis (RRMS): Patients with RRMS, which is typified by flare-ups (relapses) of symptoms interspersed with remissions, are treated with Ozanimod.

• Active Secondary Progressive Multiple Sclerosis (SPMS): In patients with active secondary progressive multiple sclerosis (SPMS), where relapses and disease activity are still evident, Ozanimod is also recommended.

Contraindications of Ozanimod

Ozanimod has several contraindications, which means that using it in specific circumstances or medical conditions is not advised because of possible dangers or adverse effects. Ozanimod contraindications consist of:

• Hypersensitivity: The drug should not be used by anyone with a history of recognized hypersensitivity or allergic reaction to Ozanimod or its ingredients.

• Recent Myocardial Infarction (Heart Attack): As Ozanimod may raise the risk of cardiovascular complications, it should not be used by anyone who has recently had a heart attack (myocardial infarction), unstable angina (chest discomfort or pain caused by insufficient blood flow), stroke (reduction or interruption in blood supply to a part of the brain), transient ischemic attack (TIA) (temporary disruption of blood supply to a part of the brain), or other major cardiovascular events.

• Severe Uncontrolled Heart Conditions: Ozanimod should not be used by patients with severe, uncontrolled heart problems because of the possible cardiovascular hazards. These conditions include heart failure, severe or unstable angina, and some types of heart block.

• Usage of Particular Medications: Ozanimod may interact with specific medications, especially those that reduce the heart rate or change cardiac rhythm (such as class I or III antiarrhythmic agents). This could make it dangerous to take these medications together.

• Severe Liver Impairment: Ozanimod should not be used in patients who have severe liver impairment (Child-Pugh Class C), as the medication may not be appropriate for them.

For Patients

Why Is Ozanimod Prescribed?

Ozanimod is primarily used to treat relapse types of multiple sclerosis (MS), though it is prescribed for the treatment of other autoimmune disorders as well.

The main purposes for prescribing Ozanimod are as follows:

• Relapsing-Remitting Multiple Sclerosis (RRMS): Patients with RRMS (relapsing-remitting multiple sclerosis) are typically treated with Ozanimod. Periods of symptom worsening (relapses) interspersed with remissions are the hallmarks of RRMS. Ozanimod is used to help people with RRMS experience fewer relapses, a slower rate of disability progression, and fewer new or increasing brain lesions.

• Active Secondary Progressive Multiple Sclerosis (SPMS): In patients with active secondary progressive multiple sclerosis (SPMS), where relapses and disease activity are still evident, Ozanimod is also recommended. This can help reduce symptoms and slow disease progression.

What Precautions Should Be Taken When Using Ozanimod?

A few precautions that should be taken while using Ozanimod are:

• Cardiovascular Health Monitoring: Ozanimod may lower the heart rate, potentially leading to symptoms of bradycardia (a slow heart rate). Before beginning treatment, it is recommended that people undergo an electrocardiogram (ECG) to assess their heart function. It is also recommended that the heart rate be monitored regularly during treatment. Individuals who use drugs that alter heart rate or have a history of specific cardiac disorders need to be properly monitored.

• Monitoring of Liver Function: Ozanimod may affect liver function. Conducting routine liver function testing, particularly in the first half-year of medication, is important. Patients who already have a liver illness or whose liver function is abnormal need closer observation.

• Blood Pressure Monitoring: Ozanimod may result in hypertension (high blood pressure). Before therapy, blood pressure should be measured and periodically evaluated during treatment. It is important to treat hypertension as needed.

• Immunizations: Before starting Ozanimod, individuals should be fully immunized against varicella and other live vaccines, as the medication may increase their risk of infection. Generally, live vaccinations are not recommended while receiving Ozanimod therapy.

• Recent Infections: If a patient has recently recovered from or is currently experiencing an infection, they should not begin Ozanimod medication. It is best to start Ozanimod when any outstanding infections have been fully treated.

• Risk of Macular Edema: Macular edema, or swelling in the macula, the central part of the retina, has been linked to Ozanimod and may result in visual impairment. People should notify their healthcare physician when they notice any changes in their vision.

• Interactions With Other Medications: Because Ozanimod may interact with other medications, potentially causing negative effects, patients should disclose to their healthcare provider all the medicines, vitamins, and herbal products they use.

• Pregnancy and Contraception: Women of reproductive potential should use effective contraception during treatment and for three months after terminating Ozanimod due to the possibility that it may harm an unborn child. Talking about family planning with a healthcare professional is crucial.

• Breastfeeding: Because Ozanimod may pass into breast milk, women should refrain from breastfeeding while on treatment and for three days following the last dosage.

• Hypersensitivity Reactions: If a patient experiences a significant hypersensitivity reaction, therapy should be stopped, and they should be monitored for any signs or symptoms.

How Is Ozanimod Taken?

Ozanimod comes in the form of a capsule, which is taken orally once daily (same time every day). Initially, a low dose is given so that the body can adjust to it and reduce side effects. After this, the dose is gradually increased to the full dose on the eighth day. Always follow the doctor’s advice on how it should be taken, and never stop the drug without asking the doctor.

What Happens if a Dose of Ozanimod Is Missed?

If a dose of Ozanimod is missed, never take an extra dose. If the dose is missed during the first two weeks of treatment, address it with your doctor, and they may restart the starter pack. If a dose is missed after two weeks of the initial treatment, take the next dose at the usual time and continue the treatment (never double it).

What Should Be Discussed With a Healthcare Provider Before Receiving Ozanimod?

Things to be discussed with a doctor before receiving Ozanimod for managing MS are:

• List all medical conditions, if present. These include any recent fever, infection, heart issues, blood pressure issues, history of stroke, liver issues, breathing issues, diabetes, and cancer (past or current).

• Inform the doctor if you have had chickenpox in the past and whether you have received a vaccine for it. If the vaccine is not taken, you may have to take the whole course and wait for a month before starting Ozanimod.

• Inform the doctor about the medications you are taking or have taken recently.

• Inform the doctor if you have received any vaccines recently or are scheduled to receive any vaccines, as Ozanimod can lower the effectiveness of vaccines. One should not take any live vaccines while taking Ozanimod. Additionally, vaccines should not be taken for at least one month before taking Ozanimod or for three months after stopping Ozanimod.

• Inform the doctor if you are pregnant or are planning to get pregnant because Ozanimod may harm the baby.

What Are the Side Effects of Ozanimod?

Like any drug, Ozanimod may cause adverse reactions. These adverse effects vary in intensity and are not always felt by the same person. It is crucial for Ozanimod users to be aware of any potential adverse effects and to notify their healthcare provider immediately if they experience any unusual or severe symptoms. The following are a few typical

Ozanimod side effects:

• Headache: One of the more typical adverse effects is a headache.

• Upper Respiratory Tract Infections: Common colds and other upper respiratory system infections may be more common.

• Increased Liver Enzymes: Ozanimod has the potential to impact liver function and cause raised liver enzyme levels. Routine liver function tests are typically performed to monitor this.

• Hypertension: Taking Ozanimod may increase blood pressure in certain people. Therefore, regular monitoring of blood pressure is necessary.

• Bradycardia (Decreased Heart Rate): Ozanimod can cause bradycardia. Therefore, monitoring heart rate is crucial, particularly for individuals with pre-existing heart conditions.

• Elevated Liver Function Tests: A rise in liver function tests may be observed in certain patients, suggesting possible liver problems.

• Herpes Zoster (Shingles): People taking Ozanimod should be closely watched for symptoms, as it may raise the chance of a reactivation of shingles.

• Macular Edema: Some individuals have reported experiencing swelling in the eye's macula, known as macular edema, which can cause vision issues.

• Increased Infection Risk: Ozanimod increases the risk of several infections, including urinary tract and lung infections. Patients should be vigilant for signs of infection and notify their healthcare practitioner promptly if they experience any issues.

• Inflammatory Bowel Disease: Patients on Ozanimod have been documented to experience cases of inflammatory bowel disease (chronic inflammation of tissues in the digestive symptoms).

• Lung Infections: Certain individuals may be at a higher risk of developing lung infections.

• Neutropenia: Ozanimod may infrequently cause a reduction in neutrophil counts, increasing the risk of infections.

• Depressed Mood: A tiny percentage of patients have been reported to have experienced mood changes, including depression and suicidal thoughts.

For Doctors:

What Are the Considerations for Dose Alterations of Ozanimod?

Ozanimod dosage adjustments should be made only based on each patient's unique medical needs and their response to the drug.

When adjusting the dosage of Ozanimod, consider the following points:

• Starting Dose: To minimize the risk of certain side effects, Ozanimod for multiple sclerosis is typically initiated with a gradual dosage schedule over several days. It is important to follow the titration plan exactly as prescribed by the doctor.

• Maintenance Dose: Patients typically reach the Ozanimod maintenance dose after completing the first titration phase. This is the dosage at which the patient's illness is effectively controlled.

• Response to Treatment: Depending on how the patient responds to treatment, dose adjustments may be considered. The healthcare practitioner may adjust the dosage if the patient experiences a noticeable increase in adverse effects or a significant decrease in disease activity.

• Adverse Reactions: Should the patient have negative reactions (severe bradycardia or macular edema) to Ozanimod, the physician may consider lowering the dosage or stopping the medication for some days.

• Monitoring: While using Ozanimod, it is important to regularly monitor the patient's health, including blood pressure, liver function, and heart rate. If any issues are detected, the dosage may need to be adjusted.

• Discontinuation: Changing the dosage may also entail stopping the drug, particularly if there are serious side effects or it is not working as intended. The healthcare provider will decide the suitable protocol for cessation.

What Are the Pharmacological Aspects of Ozanimod?

Pharmacokinetics of Ozanimod

Ozanimod's pharmacokinetics studies the drug's absorption, distribution, metabolism, and excretion in the human body. An outline of Ozanimod's pharmacokinetics is shown below:

• Absorption: Ozanimod is administered orally in tablet form. The gastrointestinal tract absorbs it quickly, with peak plasma concentrations reached four to six hours after administration. Food may influence the rate and degree of absorption; therefore, taking Ozanimod regularly, with or without food, is advised.

• Distribution: Ozanimod has a wide distribution, with spots all over the body. The medication binds significantly to albumin and other plasma proteins.

• Metabolism: Ozanimod's metabolism primarily occurs in the liver, where enzymes metabolize cytochrome P450 (CYP). Pharmacologically inactive CC112273 is the principal metabolite of Ozanimod. CYP4F2 is the primary enzyme involved in its metabolism.

• Elimination: Hepatic metabolism plays a major role in removing Ozanimod and its metabolites. A tiny portion (approximately five percent) of the dose is eliminated in the urine; the majority (approximately 81 percent) is eliminated in the feces, mostly as metabolites.

• Half-Life: Ozanimod has a half-life of between 21 and 29 hours, which means it stays in the body longer.

• Steady-State: The concentrations attain a steady state after taking Ozanimod regularly for one to two weeks.

• Drug Interactions: Interactions with other drugs may impact Ozanimod's pharmacokinetics. Caution should be exercised when taking Ozanimod in combination with medications metabolized by the same CYP enzymes.

Mechanism of Action: Ozanimod works by binding to the receptors (S1P1 and S1P5), which are present in the immune cells. This binding prevents lymphocytes from leaving lymph nodes; therefore, few lymphocytes circulate and enter the CNS, which reduces inflammation related to MS.

Pharmacodynamics of Ozanimod

Understanding how Ozanimod affects the body at the molecular, cellular, and systemic levels is known as pharmacodynamics. Ozanimod mainly affects the immune system by modulating the sphingosine-1-phosphate (S1P) receptor.

The following are the main pharmacodynamic features of Ozanimod:

• Modulation of S1P Receptors: Ozanimod is a selective modulator of some S1P receptors present on immune cells, specifically S1P1 and S1P5 receptors. It stops some immune cells, particularly lymphocytes, from leaving lymph nodes and entering the bloodstream by attaching to these receptors.

• Immune System Modulation: The immune system is modulated, which is the main pharmacodynamic impact of Ozanimod. It decreases the bloodstream's circulation of particular immune cells, mainly lymphocytes. Ozanimod reduces the number of immune cells that can move into the central nervous system by keeping these cells in the lymph nodes. This reduces the inflammatory activity and autoimmune response in diseases such as multiple sclerosis.

• Decrease in Inflammatory Attacks: In multiple sclerosis, inflammation and demyelination occur when the immune system attacks the central nervous system. The pharmacodynamic impact of Ozanimod aids in limiting the quantity of immune cells that can infiltrate the central nervous system. As a result, the frequency of inflammatory episodes, relapses, and related symptoms declines.

• Effects on Heart Rate: Ozanimod can cause your heart rate to slow. This happens because it affects special parts of your heart. Doctors need to examine your heart carefully, especially if you already have a history of heart problems.

• Decrease in New Brain Lesions: Patients with multiple sclerosis see a reduction in new or expanding brain lesions due to Ozonimod's effect on immune cell migration into the central nervous system.

Ozanimod Toxicity

When administered by prescribed therapeutic dosages, Ozanimod is typically well-tolerated. However, if overused or misused, it can have hazardous effects like any other medication. To reduce the risk of toxicity, patients must strictly adhere to the recommended dosage and treatment plan as well as the recommendations from their healthcare professional.

Some things to think about regarding Ozanimod toxicity are as follows:

• Overdose: If one takes more Ozanimod than is recommended, they run the risk of experiencing serious side effects, such as bradycardia or a sluggish heartbeat. An overdose should be quickly reported to a healthcare professional, and the patient should seek the necessary medical attention.

• Abnormal Heart Rhythms: Ozanimod may cause bradycardia, which may be hazardous if severe. When taking Ozanimod, patients with pre-existing cardiac issues may be more susceptible to irregularities in their heart rhythm.

• Macular Edema: Ozanimod has been occasionally linked to macular edema, or swelling in the macula of the eye. This needs to be watched because it may impair vision. Severe instances can be regarded as poisonous.

• Hypersensitivity Reactions: Rarely, hypersensitivity reactions might happen. These reactions can look like rashes, itching, or hives. Severe hypersensitivity reactions must be recorded, as they can be hazardous.

• Other Adverse Effects: Although not always a sign of toxicity, other Ozanimod side effects should be watched adequately since they might need to be treated differently. A few examples are headaches, elevated blood pressure, upper respiratory tract infections, and alterations in hepatic function.

What Are the Drug Interactions?

Ozanimod may interact with some drugs, requiring dose modifications. Patients should ensure that their healthcare provider is aware of all their medications and supplements.

Special Consideration in Specific Population

• Special Populations: Because Ozanimod is processed in the liver, dose adjustments might be necessary for specific populations, such as those who have liver impairment. In such situations, the medical professional may adjust the dosage according to the patient's liver function.

• Pregnancy and Contraception: If a patient becomes pregnant or plans to become pregnant, dosage adjustments may be needed. Effective contraception should be used both during therapy and for a while after finishing the medicine, as Ozanimod is not advised during pregnancy.