July 23, 2016
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Pseudovent 400

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Pseudovent 400 Capsules

Pseudovent 400 Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 3/28/2016

Pseudovent 400 (pseudoephedrine hcl extended-release and guaifenesin) is a combination of a decongestant and an expectorant used for temporary relief of symptoms due to upper respiratory tract disorders such as nasal congestion, sinusitis, and hay fever; as well as for the temporary relief of coughs associated with respiratory tract infections and related conditions such as sinusitis, pharyngitis, bronchitis, and asthma. Pseudovent 400 is available both as a prescription and over-the-counter. Common side effects of Pseudovent 400 include:

  • rapid heart rate
  • heart palpitations
  • headache
  • dizziness
  • nausea
  • anxiety
  • nervousness
  • restlessness
  • tremor
  • weakness
  • pallor
  • breathing problems
  • problems with urination
  • insomnia
  • convulsions
  • arrhythmias, and
  • low blood pressure.

The dose of Pseudovent 400 for adults and children 12 years of age and older is one capsule every 12 hours, not to exceed 2 capsules in 24 hours. Pseudovent 400 may interact with beta-blockers, MAO inhibitors, digitalis, guanethidine, mecamylamine, methyldopa, reserpine, veratrum alkaloids, antidepressants, and other vasopressor drugs. Tell your doctor all medications and supplements you use. During pregnancy, Pseudovent 400 should be used only if prescribed. Small amounts of pseudoephedrine are excreted in breast milk. It is unknown if guaifenesin passes into breast milk. Use of this product by nursing mothers is not recommended because of the higher than usual risk for infants from sympathomimetic amines. Withdrawal symptoms may occur if you suddenly stop taking this medication.

Our Pseudovent 400 (pseudoephedrine hcl extended-release and guaifenesin) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Pseudovent 400 FDA Prescribing Information: Side Effects
(Adverse Reactions)


Hyperreactive individuals may display ephedrine-like reactions such as tachycardia, palpitations, headache, dizziness, or nausea. Sympathomimetic amines have been associated with certain untoward reactions including fear, anxiety, nervousness, restlessness, tremor, weakness, pallor, respiratory difficulty, dysuria, insomnia, hallucinations, convulsions, CNS depression, arrhythmias, and cardiovascular collapse with hypotension.

Guaifenesin is well tolerated and has a wide margin of safety. Side effects are generally mild and infrequent. Nausea and vomiting are the most frequently occurring side effects.

Drug Abuse And Dependence

Central nervous system stimulants have been abused. At high doses, subjects commonly experience an elevation of mood, a sense of increased energy and alertness, and decreased appetite. Some individuals become anxious, irritable and loquacious. In addition to the marked euphoria, the user experiences a sense of markedly enhanced physical strength and mental capacity. With continued use, tolerance develops, the user increases the dose, and toxic signs and symptoms appear. Depression may follow rapid withdrawal.

Read the entire FDA prescribing information for Pseudovent 400 (Pseudoephedrine HCl Extended-Release and Guaifenesin)

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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