Metrovent
Metrovent Uses, Dosage, Side Effects, Food Interaction and all others data.
Metrovent stimulates intracellular adenyl cyclase, the enzyme that catalyses the conversion of ATP to cyclic-3',5'-adenosine monophosphate (cAMP) resulting in relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from mast cells.
Metrovent is a long acting beta-2 adrenergic receptor agonist that binds to both the active and exo sites of the beta-2 adrenergic receptor. Metrovent has a longer duration of action than other beta-2 agonists like salbutamol. Patients should be counselled regarding the risks of long acting beta agonist (LABA) monotherapy, hypokalemia, hypoglycemia, and not to take this drug with another LABA.
| Trade Name | Metrovent |
| Availability | Prescription only |
| Generic | Salmeterol |
| Salmeterol Other Names | Salmaterol, Salmeterol, Salmeterolum |
| Related Drugs | Dupixent, Xolair, ProAir Digihaler, albuterol, montelukast, Symbicort, Singulair, ProAir HFA, Breo Ellipta, Ventolin |
| Type | |
| Formula | C25H37NO4 |
| Weight | Average: 415.5656 Monoisotopic: 415.272258677 |
| Protein binding | Salmeterol is 96% protein bound in plasma to albumin and alpha-1-acid glycoprotein. |
| Groups | Approved |
| Therapeutic Class | Long-acting selective β2-adrenoceptor stimulants |
| Manufacturer | |
| Available Country | Egypt |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Inhaled Metrovent exerts a significant bronchodilating effect within 10 to 20 minutes of single-dose administration with asthma and this effect lasts for up to 12 hours or more. Metrovent has a beneficial effect on airway mucociliary clearance that will reduce the incidence of respiratory tract infections.
Metrovent produces a significant protective effect against Exercise Induced Asthma (EIA) for up to 9 to 12 hours in both adolescents and adults.
Metrovent improves the overnight PEFR (Peak Expiratory Flow Rate) and controls the symptoms of the patients with nocturnal asthma. The use of Metrovent avoids exposure of children to theophylline or high-dose corticosteroid, with their attendants risks.
Addition of Metrovent to inhaled corticosteroid therapy is significantly more effective in terms of an improvement in lung function, symptom control and a reduction in the use of rescue bronchodilator therapy (use of short acting beta2-agonist).
Addition of Metrovent to inhaled corticosteroid therapy also significantly reduces the use of inhaled corticosteroids
Metrovent is also used to associated treatment for these conditions: Asthma, Chronic Obstructive Pulmonary Disease (COPD), Exercise-Induced Bronchospasm
How Metrovent works
Beta-2 adrenoceptor stimulation causes relaxation of bronchial smooth muscle, bronchodilation, and increased airflow.
Metrovent is hypothesized to bind to 2 sites on the beta-2 adrenoceptor. The saligenin moiety binds to the active site of the beta-2 adrenoceptor. The hydrophilic tail of salmeterol binds to leucine residues in the exo-site of the beta-2 adrenoceptor almost irreversibly, allowing salmeterol to persist in the active site, which is responsible for it's long duration of action.
Another hypothesis is that the lipophilic drug diffuses into lipid bilayer of smooth muscle cells and provides a depot of drug to the cells over a longer period of time.
Dosage
Metrovent dosage
Inhalation/Respiratory-
Chronic asthma:
- Adult: As metered dose aerosol or dry powder inhaler: 50 mcg bid, or up to 100 mcg bid if necessary, in asthma patients with more severe airways obstruction.
- Child: 4-12 yr 50 mcg bid.
Prophylaxis of exercise-induced asthma:
- Adult: As metered dose aerosol or dry powd inhaler: 50 mcg at least 30 min prior to exercise.
- Child: ≥4 yr Same as adult dose.
Chronic obstructive pulmonary disease:
- Adult: As metered dose aerosol or dry powder inhaler: 50 mcg bid.
Side Effects
Dose related tremor, subjective palpitations and headaches are usually mild and transient. Skin reactions, muscle cramps, non-specific chest pain, local irritation and arthralgia have been reported.
Toxicity
Patients experiencing an overdose have presented with metabolic acidosis, hyperlactatemia, anxiety, palpitations, chest pain, sinus tachycardia, ST depression, hypokalemia, hypophosphatemia. Though patients may also present with seizures, angina, hypertension or hypotension, arrhythmia, headache, tremor, muscle cramps, dry mouth, nausea, dizziness, fatigue, malaise, insomnia, and hyperglycemia. Patients should be given symptomatic and supportive treatment which may include intravenous fluids, potassium supplementation, a cardioselective beta-blocker, and cardiac monitoring.
Data regarding the LD50 of salmeterol is not readily available.
Precaution
Patient with CV disease, CNS disorders, DM, hyperthyroidism, hypokalaemia, seizure disorders, ketoacidosis. Not intended for the relief of acute bronchospasm. Hepatic impairment. Pregnancy and lactation.
Interaction
As with all the other beta2-agonists there may be interaction with betablocking agents at the receptor site when given concomitantly.
Monoamino Oxidase Inhibitors and Tricyclic Antidepressants : These agent should be used with caution because Metrovent may be potentiated by these agents.
Food Interaction
No interactions found.Metrovent Hypertension interaction
[Moderate] Adrenergic bronchodilators can stimulate cardiovascular beta- 1 and beta- 2 receptors, resulting in adverse effects such as tachycardia, palpitation, peripheral vasodilation, blood pressure changes, and ECG changes (e.g., flattening of the T wave; prolongation of the QT interval; ST segment depression).
Direct stimulation of cardiac tissues is mediated by beta- 1 receptors and thus less likely to occur with beta-2-selective agents such as albuterol.
However, beta-2-selectivity is not absolute and can be lost with larger doses.
High dosages of these agents have been associated with precipitation or aggravation of angina, myocardial ischemia, and cardiac arrhythmias.
Therapy with adrenergic bronchodilators should be administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, and The recommended dosages should not be exceeded.
Metrovent Drug Interaction
Moderate: duloxetine, escitalopram, budesonide / formoterol, albuterolMinor: fluticasone / salmeterolUnknown: aspirin, aspirin, ipratropium, amoxicillin / clavulanate, celecoxib, rosuvastatin, heparin, atorvastatin, acetaminophen, clopidogrel, montelukast, tiotropium, cyanocobalamin, ascorbic acid, cholecalciferol
Metrovent Disease Interaction
Moderate: cardiovascular, diabetes, hypokalemia, seizures, hepatic dysfunction
Volume of Distribution
In asthmatic patients, the volume of distribution of the central compartment is 177L and the volume of distribution of the peripheral compartment is 3160L.
Elimination Route
In asthmatic patients, a 50µg dose of inhaled salmeterol powder reaches a Cmax of 47.897pg/mL, with a Tmax of 0.240h, and an AUC of 156.041pg/mL/h.
Half Life
The half life of salmeterol is 5.5h.
Clearance
The average clearance of salmeterol in a group of asthmatic patients was 392L/h. Further data regarding the clearance of salmeterol is not readily available.
Elimination Route
Metrovent is 57.4% eliminated in the feces and 23% in the urine. Less than 5% of a dose is eliminated in the urine as unchanged salmeterol.
Pregnancy & Breastfeeding use
Pregnancy Category C. Either studies in animals have revealed adverse effects on the foetus (teratogenic or embryocidal or other) and there are no controlled studies in women or studies in women and animals are not available. Drugs should be given only if the potential benefit justifies the potential risk to the foetus.
Contraindication
Monotherapy in the treatment of asthma. Treatment of status asthmaticus, other acute episodes of asthma or COPD.
Special Warning
Hepatic Impairment: Because Metrovent is extensively metabolised by the liver, patients with hepatic impairment receiving the drug should be closely monitored.
Acute Overdose
Symptoms: Dizziness, HTN or hypotension, tremor, headache, tachycardia, hypokalaemia, seizures, angina, arrhythmias, nervousness, muscle cramps, dry mouth, palpitations, nausea, fatigue, malaise, insomnia, hyperglycaemia, metabolic acidosis.
Management: Symptomatic and supportive treatment. β-blockers may be considered but should be used with caution.
Storage Condition
Store between 20-25° C. Protect from heat or sunlight.
Innovators Monograph
You find simplified version here Metrovent
Metrovent contains Salmeterol see full prescribing information from innovator Metrovent Monograph, Metrovent MSDS, Metrovent FDA label
FAQ
What is Metrovent used for?
Metrovent is used to control wheezing, shortness of breath, coughing, and chest tightness in people with chronic obstructive pulmonary disease.
How safe is Metrovent?
Metrovent may increase the risk of asthma-related death. Use only the prescribed dose of this medication, and do not use it for longer than your doctor recommends. Follow all patient instructions for safe use. Talk with your doctor about your individual risks and benefits of using salmeterol inhalation.
What are the common side effects of Metrovent?
Metrovent may common side effects are include:
- shaking of a part of your body that you cannot control
- headache
- nervousness
- dizziness
- cough
- stuffed nose
- runny nose
- ear pain
- muscle pain, stiffness, or cramps
- joint pain
- sore, irritated throat
- flu-like symptoms
- nausea
- heartburn
- tooth pain
- dry mouth
- sores or white patches in the mouth
- red or irritated eyes
- difficulty falling asleep or staying asleep
- burning or tingling of the hands or feet
Is Metrovent safe during pregnancy?
Metrovent has been considered a medication of choice if long-acting beta agonist treatment is needed during pregnancy. If a woman's asthma was well-controlled with Metrovent before pregnancy, it may be recommended to continue using it during pregnancy.
Is Metrovent safe during breastfeeding?
Using a Metrovent inhaler is not thought to cause high enough levels in the mother's bloodstream to pass into breast milk in large amounts. Using inhaled bronchodilators is usually thought to be compatible with breastfeeding.
Can I drink alcohol with Metrovent?
Yes, you can drink alcohol with Metrovent.
Can I drive after taking Metrovent ?
Monitor serum potassium level while taking Metrovent. It may cause dizziness, do not drive a car or operate machinery while taking Metrovent.
When should Metrovent be taken?
Metrovent is usually used twice a day, in the morning and evening, about 12 hours apart. Use Metrovent at around the same times every day.
How long does it take for Metrovent to work?
Metrovent is called a long-acting bronchodilator. Its effects are usually felt within 20 minutes and last for around 12 hours.
Is Metrovent a reliever?
Metrovent is called a long-acting bronchodilator. It is usually used with both a fast-acting reliever and preventer medicine.
Is Metrovent fast acting?
Metrovent is a partial agonist, has a relatively slow onset of action (10 to 30 minutes)
Does Metrovent increase blood pressure?
Metrovent can increase heart rate, blood pressure, and cause chest pain and excitement, especially if used in higher doses than recommended or used in those with coronary heart disease or high blood pressure.
Can Metrovent cause anxiety?
Possible side effects include nervousness, sweating, fast heartbeat, and anxiety.
Can I overdose on Metrovent?
If this medication is administered by a healthcare provider in a medical setting, it is unlikely that an overdose will occur. However, if overdose is suspected, seek emergency medical attention.
Does Metrovent cause thrush?
Metrovent may cause a fungus infection of the mouth or throat (thrush).
What happens if I miss a dose?
Skip the missed dose and continue your regular dosing schedule. Do not inhale a double dose to make up for a missed one.
Is Metrovent inhaler a steroid?
Metrovent a combination of a steroid plus a long-acting bronchodilator. fluticasone furoate(Trelegy Ellipta) a combination of a steroid, an anticholinergic, and a long-acting bronchodilator drug.
Can I stop using Metrovent?
Do not stop using Metrovent without talking to your doctor. If you suddenly stop using Metrovent, your symptoms may worsen. Before you use the Metrovent inhaler the first time, ask your doctor, pharmacist, or respiratory therapist to show you how to use it.
How do you stop taking Metrovent?
Do not stop using Metrovent inhalation without first talking to your doctor. Your asthma symptoms may get worse after you stop using the medication. If you also use a steroid medication, you should not stop using it suddenly. Follow your doctor's instructions about tapering your dose.
