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Note: This document contains side effect information about pseudoephedrine. Some of the dosage forms listed on this page may not apply to the brand name SudoGest 12 Hour.
Applies to pseudoephedrine: oral capsule liquid filled, oral liquid, oral solution, oral syrup, oral tablet, oral tablet extended release
Along with its needed effects, pseudoephedrine (the active ingredient contained in SudoGest 12 Hour) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur while taking pseudoephedrine:
Rare- more common with high doses
Symptoms of overdose
Some side effects of pseudoephedrine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Applies to pseudoephedrine: compounding powder, oral capsule, oral liquid, oral suspension extended release, oral tablet, oral tablet chewable, oral tablet extended release
The most commonly reported adverse effects have included cardiovascular and (e.g. elevated blood pressure, tachycardia, or arrhythmias), CNS stimulation (e.g. restlessness, insomnia, anxiety, tremors, and rarely hallucinations), skin rashes, and urinary retention.
Frequency not reported: Tachycardia, palpitations, arrhythmia, hypertension, impaired circulation to the extremities
Frequency not reported: Headache, tremor
Frequency not reported: Dry mouth, nausea, vomiting
Frequency not reported: Hypersensitivity reactions including cross-sensitivity with other sympathomimetic
Rare (less than 0.1%): Hallucinations
Frequency not reported: Restlessness, insomnia, sleep disturbances, anxiety, excitability
Frequency not reported: Urinary retention, especially in men with prostatic enlargement
Frequency not reported: Angle-closure glaucoma
Frequency not reported: Skin rashes, fixed drug eruption in the form of erythematous nodular patches
Post marketing reports: False-positive amphetamine immunoassay
False-positives can occur far below the published threshold indicating that cross-reactivity in human specimens is sometimes greater than the limits reported.
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