Clemastina is one effective antihistamine that can quickly reduce allergic symptoms within 24 hours. There are a number of precautions and side effects to watch out for so that patients stay safe.
Clemastina is the generic name of the antihistamine medication having sedative and anticholinergic effects. It is used for the treatment of allergic symptoms like runny nose, swelling, itchy skin, hives, rash, sneezing, red and teary eyes and pruritus. It is also known as meclastin and classified as an antipruritic. Clemastina is able to increase capillary dilatation and permeability as well as improve gastrointestinal and respiratory smooth muscle contraction.
Depending on the amount used, Clemastina can cause paradoxical effects like CNS depression and stimulation. By blocking the effects of natural-occurring histamine chemical, it inhibits histamine's vasodilator and vasoconstrictor effects. The medication comes in the form of tablets and extended-release tablets, which should be taken orally. It is also available in syrup under the brand name Tavist.
Just like all other medicaments, Clemastina can cause many side effects like drowsiness, dry mouth, nose or throat, dizziness, chest congestion, headache, upset stomach, excitability, nervousness, pupil dilation, extra sunlight sensitivity, heart palpitation, sleepiness, enlarged prostate and difficulty urinating. These symptoms should be reported to the doctor especially if they become severe. Other adverse reactions include loss of appetite, vision changes and irritability. Some symptoms are mild and will only be present as the body adjusts to the medication. Serious side effects like breathing difficulty, irregular heartbeat and ear ringing should be taken care of immediately.
Patients with known hypersensitivity reactions to the medication should never take it. Those with a history of lung disease, asthma, glaucoma, ulcers, difficulty urinating, enlarged prostate, overactive thyroid, high blood pressure, seizure and heart disease should consult their doctor first before consumption. Breastfeeding mothers and pregnant women should ask their doctor first and elderly patients may require lower dosages since they are more sensitive to the medication. Clemastina can also interact with medicaments like MAOIs or monoamine oxidase inihibitors, sedatives, tranquilizers, narcotics and antipsychotics.
Clemastina acts by aggressively binding to H1-receptor sites making it a selective histamine H1 antagonist. The sites are then blocked, stopping endogenous histamine from attaching. When endogenous histamine is blocked, it cannot act and cause symptoms and reactions. As a result, the patient experiences temporary relief. The medication is thought to be metabolized in the liver by mono-didemethylation and glucuronide conjugation.
12 patients suffering from anaphylactic reactions were given 1 mg of Clemastina 4 times a day for 3 days. Within the first 24 hours, all patients had reduced symptoms and were completely free of symptoms by the second day. The only drawback was that 10 of the patients reported sleepiness that lasted up to 1 week after treatment was over.
Clemastina is an over-the-counter or OTC medication so a prescription is no longer needed. It is available in almost all pharmacies and doctors' clinics. Check the expiration date and manufacturer upon purchase to ensure quality and freshness. The medication may also be ordered online at certified pharmacies.
Drowsiness is one of the most common side effects of Clemastina so patients should not drive or operate heavy machinery until full effects are realized. Children younger than 12 years old should ask a doctor first to ensure safety. The medication should be stored at room temperature away from sunlight and moisture. Dosage should also be followed religiously and patients should never take more or less than recommended.
Clemastina has the following structural formula:
• Molecular formula of clemastina is C21H26ClNO
• Chemical IUPAC Name is 2-[2-[1-(4-chlorophenyl)-1-phenyl-ethoxy]ethyl]-1-methyl-pyrrolidine
• Molecular weight is 343.89 g/mol
• Clemastina available : 1mg tablets
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