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Methylephedrine, sold under the brand name Metheph among others, is a sympathomimetic medication described as an antiasthmatic agent and used to treat coughing and nasal congestion. [ 3 ] [ 4 ] [ 1 ] It is reported to be used in various over-the-counter cough and cold preparations throughout the world, including Japan .
Levmetamfetamine is used to treat nasal congestion related to the common cold and allergic rhinitis. It is available in the form of an inhaler containing 50 mg total per inhaler and delivering between 0.04 and 0.15 mg of the drug per inhalation. [2]
It also includes drugs which are marketed as cough suppressants or antitussives, but their effectiveness in reducing cough symptoms is unclear or minimal. [ 1 ] [ 2 ] [ 3 ] While they have been used by 10% of American children in any given week, they are not recommended in Canada or the United States in children six years or younger because of ...
Their effectiveness by themselves in the common cold appears to have a small benefit in adults. [1] Topical decongestants should only be used by patients for a maximum of 5–7 days in a row, because rebound congestion may occur in the form of rhinitis medicamentosa. When used in adults for a short period of time side effects appear to be few. [1]
A decongestant, or nasal decongestant, is a type of pharmaceutical drug that is used to relieve nasal congestion in the upper respiratory tract.The active ingredient in most decongestants is either pseudoephedrine or phenylephrine (the latter of which has disputed effectiveness).
As a cough suppressant, the polistirex version lasts up to 12 hours. This duration also holds true when used recreationally. In 1981, a paper by Gosselin estimated that the lethal dose is between 50 and 500 mg/kg. Doses as high as 15–20 mg/kg are taken by some recreational users.
Vaccine combinations (few exceptions), antibiotics, low-dose steroids (less than 20 mg per day), minor infections with low fever (below 38.5º Celsius), diarrhea, malnutrition, kidney or liver disease, heart or lung disease, non-progressive encephalopathy, well controlled epilepsy or advanced age, are not contraindications to vaccination.
Phenylpropanolamine was previously available in the United States over-the-counter and in certain combination drug forms by prescription. [24] [25] One such example of the latter was a combination of phenylpropanolamine and chlorpheniramine, which dually contained decongestant and antihistamine effects, marketed by Tutag as 'Vernate'.