Allerest No Drowsiness Side Effects
Generic Name: acetaminophen / pseudoephedrine
Note: This document contains side effect information about acetaminophen / pseudoephedrine. Some of the dosage forms listed on this page may not apply to the brand name Allerest No Drowsiness.
For the Consumer
Applies to acetaminophen / pseudoephedrine: oral tablet
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.
- Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
- Not able to pass urine or change in how much urine is passed.
- A very bad skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis) may happen. It can cause very bad health problems that may not go away, and sometimes death. Get medical help right away if you have signs like red, swollen, blistered, or peeling skin (with or without fever); red or irritated eyes; or sores in your mouth, throat, nose, or eyes.
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 any of these side effects or any other side effects bother you or do not go away:
- Feeling nervous and excitable.
- Not able to sleep.
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.
For Healthcare Professionals
Cardiovascular adverse effects of pseudoephedrine have included significant rises in heart rate. Hypertension and arrhythmias have been problematic in susceptible patients.[Ref]
Pseudoephedrine causes vasoconstriction which generally does not produce hypertension, but may be problematic for patients with preexisting hypertension. Arrhythmias may be produced in predisposed patients. Rarely, pseudoephedrine has been reported to cause coronary artery spasm and chest pain.[Ref]
Nervous system side effects of pseudoephedrine have included nervous system stimulation, resulting in tremor, anxiety, and nervousness. Insomnia has been reported in up to 30% of pseudoephedrine-treated patients. Headache has also occurred in patients receiving pseudoephedrine.[Ref]
Hepatic side effects of acetaminophen have been rare, except in alcoholics and after overdose. In these settings, severe and sometimes fatal (3% to 4%) dose-dependent hepatitis has been reported. Several cases of hepatotoxicity from chronic acetaminophen therapy at therapeutic doses have also been reported despite a lack of risk factors for toxicity[Ref]
Alcoholic patients may develop hepatotoxicity after even modest doses of acetaminophen. In healthy patients, approximately 15 grams of acetaminophen is necessary to deplete liver glutathione stores by 70% in a 70 kg person, although hepatotoxicity has been reported with smaller doses. Glutathione concentrations may be repleted by the antidote N-acetylcysteine. One case report has suggested that hypothermia may also be beneficial in decreasing liver damage during overdose.
In a recent retrospective study of 306 patients admitted for acetaminophen overdose, 6.9% had severe liver injury but all recovered. None of the 306 patients died.
One study has suggested that acetaminophen may precipitate acute biliary pain and cholestasis. The mechanism for this side effect may be related to inhibition of prostaglandin and alterations in the regulation of the sphincter of oddi.[Ref]
Gastrointestinal side effects of acetaminophen are rare, except in alcoholics and after overdose. Cases of acute pancreatitis have been reported rarely with acetaminophen use.
Gastrointestinal side effects of pseudoephedrine have included anorexia and gastric irritation in approximately 5% of patients. Dry mouth, nose, or throat has occurred in up to 15% of patients.[Ref]
Renal side effects of acetaminophen have been rare and included acute tubular necrosis and interstitial nephritis. Adverse renal effects were most often observed after overdose, after chronic abuse (often with multiple analgesics), or in association with acetaminophen-related hepatotoxicity.[Ref]
Acute tubular necrosis usually occurs in conjunction with liver failure, but has been observed as an isolated finding in rare cases.[Ref]
Hematologic side effects have included rare cases of thrombocytopenia associated with acetaminophen. Acute thrombocytopenia has also been reported as having been caused by sensitivity to acetaminophen glucuronide, the major metabolite of acetaminophen. Methemoglobinemia with resulting cyanosis has also been observed in the setting of acute overdose.[Ref]
Hypersensitivity reactions to pseudoephedrine have included fixed drug eruptions.[Ref]
Dermatologic side effects have included rare reports of general erythematous skin rashes associated with acetaminophen. A rare case of bullous erythema associated with acetaminophen has been reported. Acetaminophen has been associated with a risk of rare but potentially fatal serious skin reactions known as Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and acute generalized exanthematous pustulosis (AGEP).[Ref]
Metabolic side effects including metabolic acidosis have been reported following a massive overdose of acetaminophen.
In the case of metabolic acidosis, causality is uncertain as more than one drug was ingested. The case of metabolic acidosis followed the ingestion of 75 grams of acetaminophen, 1.95 grams of aspirin, and a small amount of a liquid household cleaner. The patient also had a history of seizures which the authors reported may have contributed to an increased lactate level indicative of metabolic acidosis.
1. Rosen RA "Angina associated with pseudoephedrine ." Ann Emerg Med 10 (1981): 230-1
2. Mariani PJ "Pseudoephedrine-induced hypertensive emergency: treatment with labetalol." Am J Emerg Med 4 (1986): 141-2
3. Covington TR, Lawson LC, Young LL, eds. "Handbook of Nonprescription Drugs. 10th ed." Washington, DC: American Pharmaceutical Association (1993):
4. Wiener I, Tilkian AG, Palazzolo M "Coronary artery spasm and myocardial infarction in a patient with normal coronary arteries: temporal relationship to pseudoephedrine ingestion." Cathet Cardiovasc Diagn 20 (1990): 51-3
5. Gordon RD, Ballantine DM, Bachmann AW "Effects of repeated doses of pseudoephedrine on blood pressure and plasma catecholamines in normal subjects and in patients with phaeochromocytoma." Clin Exp Pharmacol Physiol 19 (1992): 287-90
6. Dickerson J, Perrier D, Mayersohn M, Bressler R "Dose tolerance and pharmacokinetic studies of L (+) pseudoephedrine capsules in man." Eur J Clin Pharmacol 14 (1978): 253-9
7. Stroh JE, Jr Ayars GH, Bernstein IL, Kemp JP, Podleski WK, Prenner BM, Schoenwetter WF, Salzmann JK "A comparative tolerance study of terfenadine-pseudoephedrine combination tablets and pseudoephedrine tablets in patients with allergic or vasomotor rhinitis." J Int Med Res 16 (1988): 420-7
8. Loizou LA, Hamilton JG, Tsementzis SA "Intracranial haemorrhage in association with pseudoephedrine overdose." J Neurol Neurosurg Psychiatry 45 (1982): 471-2
9. Mofenson HC, Caraccio TR, Nawaz H, Steckler G "Acetaminophen induced pancreatitis." Clin Toxicol 29 (1991): 223-30
10. Keays R, Harrison PM, Wendon JA, et al "Intravenous acetylcysteine in paracetamol induced fulminant hepatic failure: a prospective controlled trial." BMJ 303 (1991): 1026-9
11. Kaysen GA, Pond SM, Roper MH, Menke DJ, Marrama MA "Combined hepatic and renal injury in alcoholics during therapeutic use of acetaminophen." Arch Intern Med 145 (1985): 2019-23
12. Kumar S, Rex DK "Failure of physicians to recognize acetaminophen hepatotoxicity in chronic alcoholics." Arch Intern Med 151 (1991): 1189-91
13. Lee WM "Acute liver failure." Am J Med 96 (1994): 3-9
14. McJunkin B, Barwick KW, Little WC, Winfield JB "Fatal massive hepatic necrosis following acetaminophen overdose." JAMA 236 (1976): 1874-5
15. Block R, Jankowski JA, Lacoux P, Pennington CR "Does hypothermia protect against the development of hepatitis in paracetamol overdose?" Anaesthesia 47 (1992): 789-91
16. Rumore MM, Blaiklock RG "Influence of age-dependent pharmacokinetics and metabolism on acetaminophen hepatotoxicity." J Pharm Sci 81 (1992): 203-7
17. Block R "Liver failure induced by paracetamol." BMJ 306 (1993): 457
18. O'Dell JR, Zetterman RK, Burnett DA "Centrilobular hepatic fibrosis following acetaminophen-induced hepatic necrosis in an alcoholic." JAMA 255 (1986): 2636-7
19. Minton NA, Henry JA, Frankel RJ "Fatal paracetamol poisoning in an epileptic." Hum Toxicol 7 (1988): 33-4
20. Bonkovsky HL, Kane RE, Jones DP, Galinsky RE, Banner B "Acute hepatic and renal toxicity from low doses of acetaminophen in the absence of alcohol abuse or malnutrition - evidence for increased susceptibility to drug toxicity due to cardiopulmonary and renal insufficiency." Hepatology 19 (1994): 1141-8
21. Wong V, Daly M, Boon A, Heatley V "Paracetamol and acute biliary pain with cholestasis." Lancet 342 (1993): 869
22. Bray GP "Liver failure induced by paracetamol." BMJ 306 (1993): 157-8
23. Seeff LB, Cuccherini BA, Zimmerman HJ, Adler E, Benjamin SB "Acetaminophen hepatotoxicity in alcoholics." Ann Intern Med 104 (1986): 399-404
24. Brotodihardjo AE, Batey RG, Farrell GC, Byth K "Hepatotoxicity from paracetamol self-poisoning in Western Sydney: a continuing challenge." Med J Aust 157 (1992): 382-5
25. Keaton MR "Acute renal failure in an alcoholic during therapeutic acetaminophen ingestion." South Med J 81 (1988): 1163-6
26. Shriner K, Goetz MB "Severe hepatotoxicity in a patient receiving both acetaminophen and zidovudine." Am J Med 93 (1992): 94-6
27. Johnson GK, Tolman KG "Chronic liver disease and acetaminophen." Ann Intern Med 87 (1977): 302-4
28. Goldberg M "Analgesic nephropathy in 1981: which drug is responsible?" JAMA 247 (1982): 64-5
29. Vanchieri C "Australian study links certain analgesics to renal cancers." J Natl Cancer Inst 85 (1993): 262-3
30. Boyer TD, Rouff SL "Acetaminophen-induced hepatic necrosis and renal failure." JAMA 218 (1971): 440-1
31. Segasothy M, Suleiman AB, Puvaneswary M, Rohana A "Paracetamol: a cause for analgesic nephropathy and end-stage renal disease." Nephron 50 (1988): 50-4
32. McCredie M, Stewart JH, Day NE "Different roles for phenacetin and paracetamol in cancer of the kidney and renal pelvis." Int J Cancer 53 (1993): 245-9
33. Kleinman JG, Breitenfield RV, Roth DA "Transient cholestatic hepatitis in a neonate associated with carbamazepine exposure during pregnancy and breast-feeding." Clin Nephrol 14 (1980): 201-5
34. Duchene A, Chadenas D, Marneffe-Lebrequier H "Insuffisance renale aigue isolee apres intoxication volontaire par le paracetamol." Presse Med 20 (1991): 1684-5
35. Curry RW, Robinson JD, Sughrue MJ "Acute renal failure after acetaminophen ingestion." JAMA 247 (1982): 1012-4
36. Bougie DW, Benito AI, Sanchez-Abarca LI, Torres R, Birenbaum J, Aster RH "Acute thrombocytopenia caused by sensitivity to the glucuronide conjugate of acetaminophen." Blood 109 (2007): 3608-9
37. Shoenfeld Y, Shaklai M, Livni E, Pinkhas J "Thrombocytopenia from acetaminophen." N Engl J Med 303 (1980): 47
38. Shelley WB, Shelley ED "Nonpigmenting fixed drug eruption as a distinctive reaction pattern: examples caused by sensitivity to pseudoephedrine hydrochloride and tetrahydrozoline." J Am Acad Dermatol 17 (1987): 403-7
39. Tomb RR, Lepoittevin JP, Espinassouze F, Heid E, Foussereau J "Systemic contact dermatitis from pseudoephedrine." Contact Dermatitis 24 (1991): 86-8
40. Settipane RA, Stevenson DD "Cross sensitivity with acetaminophen in aspirin-sensitive subjects with asthma." J Allergy Clin Immunol 84 (1989): 26-33
41. Kalyoncu AF "Acetaminophen hypersensitivity and other analgesics." Ann Allergy 72 (1994): 285
42. Camisa C "Fixed drug eruption due to pseudoephedrine." Cutis 41 (1988): 339-40
43. Doan T "Acetaminophen hypersensitivity and other analgesics - response." Ann Allergy 72 (1994): 285
44. Doan T, Greenberger PA "Nearly fatal episodes of hypotension, flushing, and dyspnea in a 47- year-old woman." Ann Allergy 70 (1993): 439-44
45. Leung R, Plomley R, Czarny D "Paracetamol anaphylaxis." Clin Exp Allergy 22 (1992): 831-3
46. Van Diem L, Grilliat JP "Anaphylactic shock induced by paracetamol." Eur J Clin Pharmacol 38 (1990): 389-90
47. Thomas RH, Munro DD "Fixed drug eruption due to paracetamol." Br J Dermatol 115 (1986): 357-9
48. Guccione JL, Zemtsov A, Cobos E, Neldner KH "Acquired purpura fulminans induced by alcohol and acetaminophen - successful treatment with heparin and vitamin-k." Arch Dermatol 129 (1993): 1267-9
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.
More about Allerest No Drowsiness (acetaminophen / pseudoephedrine)
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- Drug class: upper respiratory combinations