Phlemex Side Effects
Generic Name: dextromethorphan / guaifenesin
Note: This document contains side effect information about dextromethorphan / guaifenesin. Some of the dosage forms listed on this page may not apply to the brand name Phlemex.
For the Consumer
Applies to dextromethorphan / guaifenesin: oral capsule, oral liquid, oral packet, oral solution, oral syrup, oral tablet, oral tablet extended release 12 hour
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
What are some other side effects of this drug?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if you have any side effects that bother you or do not go away.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
For Healthcare Professionals
Applies to dextromethorphan/guaifenesin: oral capsule, oral capsule extended release, oral elixir, oral granule, oral liquid, oral suspension extended release, oral tablet, oral tablet extended release
Nervous system side effects of dextromethorphan have included drowsiness and dizziness. Adverse effects, which have occurred at higher doses, include excitation, mental confusion, and opioid like respiratory depression. In some cases of abuse, patients have experienced euphoria, hyperactivity, mania, and auditory and visual hallucinations.[Ref]
Hypersensitivity side effects of dextromethorphan have included fixed-drug eruptions.[Ref]
1. Wolfe TR, Caravati EM "Massive dextromethorphan ingestion and abuse." Am J Emerg Med 13 (1995): 174-6
2. Hall RC, Beresford TP, Stickney SK, Nasdahl CS, Coleman JH "Psychiatric reactions produced by respiratory drugs." Psychosomatics 26 (1985): 605-8,616-7
3. Murray S, Brewerton T "Abuse of over-the-counter dextromethorphan by teenagers." South Med J 86 (1993): 1151-3
4. Helfer J, Kim OM "Psychoactive abuse potential of Robitussin-DM." Am J Psychiatry 147 (1990): 672-3
5. Bostwick JM "Dextromethorphan-induced manic symptoms in a bipolar patient on lithium." Psychosomatics 37 (1996): 571-2
6. "Product Information. Tussi-Organidin DM NR (dextromethorphan-guaifenesin)" Wallace Laboratories, Cranbury, NJ.
7. Polles A, Griffith JL "Dextromethorphan-induced mania." Psychosomatics 37 (1996): 71-4
8. Covington TR, Lawson LC, Young LL, eds. "Handbook of Nonprescription Drugs. 10th ed." Washington, DC: American Pharmaceutical Association (1993):
9. Stubb S, Reitamo S "Fixed-drug eruption due to dextromethorphan ." Arch Dermatol 126 (1990): 970-1
Some side effects may not be reported. You may report them to the FDA.
More about Phlemex (dextromethorphan / guaifenesin)
- During Pregnancy
- Dosage Information
- Drug Interactions
- En Español
- Drug class: upper respiratory combinations