See also:
What is the most important information I should know about Lantex-LA?
Phenylephrine hydrochloride should not be used in patients with severe hypertension, ventricular tachycardia, or in patients who are hypersensitive to it or to any of the components.
No serious side effects from Lantex-LA are expected. Seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).
Other, less serious side effects may be more likely to occur. Continue to take Lantex-LA and talk to your doctor if you experience
dizziness or headache;
nervousness, restlessness, or insomnia;
nausea or stomach upset; or
difficulty urinating.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
symptoms associated with nasal congestion and viscous mucous
Guaifenesin (Lantex-LA) is an expectorant. It is used to break up congestion and mucous to make breathing easier. Guaifenesin (Lantex-LA) thins mucous, increases lubrication of the respiratory tract (lungs, nose and throat), and increases the removal of mucous.
Phenylpropanolamine (Lantex-LA) is a decongestant. It constricts (shrinks) blood vessels (veins and arteries), which reduces swelling of mucous membranes in areas such as the nose and sinuses.
Lantex-LA is used to treat the symptoms of the common cold and of infections of the sinuses, lungs, and throat.
Phenylpropanolamine (Lantex-LA), an ingredient in this product, has been associated with an increased risk of hemorrhagic stroke (bleeding into the brain or into tissue surrounding the brain) in women. Men may also be at risk. Although the risk of hemorrhagic stroke is low, the U.S. Food and Drug Administration (FDA) recommends that consumers not use any products that contain Phenylpropanolamine (Lantex-LA).
Lantex-LA may also be used for purposes other than those listed in this medication guide.
Lantex-LA has been withdrawn in Canada. In November 2000, the Food and Drug Administration (FDA) issued a public health advisory against the use of the drug.
Usual Adult Dose for Cough and Nasal Congestion:
5 mL to 10 mL (100 mg-12.5 mg/5 mL) orally every 4 hours.
-or-
20 mL (50 mg-6.25 mg/5 mL) orally every 4 hours.
-or-
Extended release: 1 tablet (40 mg to 50 mg Phenylpropanolamine (Lantex-LA)) orally every 12 hours.
Maximum is 150 mg Phenylpropanolamine (Lantex-LA) or 2.4 grams of Guaifenesin (Lantex-LA)/day.
Usual Pediatric Dose for Cough and Nasal Congestion:
6 to 12 years:
1 mL (50 mg-6.25 mg/mL) orally every 4 hours. (Drops - Note concentration).
-or-
1 mL (30 mg-6.25 mg/mL) orally every 4 hours. (Drops - Note concentration).
-or-
5 mL (100 mg-6.25 mg/5 mL) orally every 4 hours.
Maximum is 75 mg Phenylpropanolamine (Lantex-LA) or 1.2 grams of Guaifenesin (Lantex-LA)/day.
Over 12 years:
10 mL (100 mg-6.25 mg/5 mL) orally every 4 hours.
Maximum is 150 mg Phenylpropanolamine (Lantex-LA) or 2.4 grams of Guaifenesin (Lantex-LA)/day.
See also:
What other drugs will affect Lantex-LA?
Vasopressors, particularly metaraminol, may cause serious cardiac arrhythmias during halothane anesthesia and therefore should be used only with great caution or not at all.
MAO Inhibitors - The pressor effect of sympathomimetic pressor amines is markedly potentiated in patients receiving monoamine oxidase inhibitors (MAOI). Therefore, when initiating pressor therapy in these patients, the initial dose should be small and used with due caution. The pressor response of adrenergic agents may also be potentiated by tricyclic antidepressants.
