Medication Name: Meldonium
Chemical Composition
Meldonium, also known as Mildronate or THP (trimethylhydrazinium propionate), is a compound comprising of C6H14N2O2. It is a quaternary ammonium salt with properties that include being a structural analog of gamma-butyrobetaine, which is a precursor in the biosynthesis of carnitine.
Pharmacokinetics
Meldonium is absorbed rapidly and completely following oral administration. Peak plasma concentrations are typically reached within 1 to 2 hours post-administration. The bioavailability of the oral dose ranges from 78% to 80%. It undergoes extensive metabolism in the liver, with half-life elimination observed around 3 to 6 hours.
Mechanism of Action
Meldonium inhibits gamma-butyrobetaine dioxygenase, an enzyme involved in the biosynthesis of carnitine. By reducing carnitine levels, it subsequently reduces the fatty acid oxidation within mitochondria. This shift encourages glucose metabolism over fatty acid metabolism, which is more oxygen-efficient, thus potentially boosting energy levels and improving endurance.
Primary Uses
Meldonium is predominantly utilized in the management of ischemic heart disease, angina pectoris, heart failure, and myocardial infarction. It is also applied in treating chronic obstructive pulmonary disease (COPD) and aiding physical and mental performance enhancement, particularly in cases of physical overexertion and rehabilitation post-surgery.
Dosage Forms
Meldonium is available in several forms: oral capsules, tablets, and injectable solutions. The oral capsule form is typically found in strengths of 250mg and 500mg. The injectable form is generally provided in 100mg/mL strength for ease of intravenous or intramuscular administration.
Recommended Dosage
The standard oral dosage for treating ischemic heart diseases is 500mg to 1000mg daily, usually divided into two doses. For physical and mental performance enhancement, a typical dosage ranges from 500mg to 750mg per day. The injectable form is often administered at a dosage of 500mg once daily.
Possible Side Effects
Meldonium usage can lead to potential side effects including headache, dizziness, nausea, and gastrointestinal disturbances. Rarely, allergic reactions, such as skin rashes or itching, may occur. In some cases, transient hypotension has been reported. Always monitor patients for adverse reactions.
Contraindications
Meldonium is contraindicated in individuals with known hypersensitivity to the drug. Itâs also advised against usage in severe renal and hepatic insufficiency. Not recommended for individuals diagnosed with chronic epilepsy and those with intracranial hypertension.
Drug Interactions
Meldonium can interact with anticoagulants and other medications influencing blood viscosity. Caution is advised when used alongside drugs metabolized via the same pathways or impacting cardiovascular function, as this can potentiate or diminish the effects of either drug.
Storage Requirements
Meldonium should be stored in its original packaging, kept at room temperature, away from moisture and heat. It should be stored out of reach of children and protected from light exposure to maintain its integrity and effectiveness.
Special Populations
In elderly patients, dosage adjustments might be necessary due to the possible decline in renal function. In patients with hepatic impairment, careful monitoring is advised due to altered drug metabolism. The safety and efficacy in children have not been established, hence its use in pediatric populations should be avoided.
Monitoring Parameters
Patients should be regularly monitored for signs of cardiovascular anomalies, blood pressure variations, and liver function tests. Continuous assessment of renal function is crucial in long-term use. Patient’s adherence and response to therapy should be monitored to determine efficacy and safety.
Laboratory Test Alterations
Meldonium may influence certain laboratory tests by altering parameters like lactate and glucose levels. It could also potentially affect cholesterol and triglyceride levels. These variations should be considered when interpreting results in patients undergoing meldonium therapy.
Pharmacological Classification
Meldonium falls under the pharmacological category of metabolic modulators. It is identified as a cardioprotective medication, with properties enhancing physical performance, often classified as an anti-ischemic drug.
Regulatory Status
Meldonium is not approved by the U.S. FDA but is registered for medical use in several European countries and in Russia. It was added to the World Anti-Doping Agencyâs list of banned substances in 2016 due to its performance-enhancing properties.
Handling Precautions
Meldonium should be handled with care, avoiding exposure to extreme temperatures. Use personal protective equipment to prevent inhalation or contact with skin or eyes. Proper disposal methods should be used to avoid environmental contamination.