On call. I have a long history of tension headaches and usually get relief by taking acetaminophen. Lately, the medication relieves the headache, but then the pain returns later in the day. Can acetaminophen lose its effectiveness, or could it be something else?

Authors	William Kormos
Journal	Harvard men's health watch (Harv Mens Health Watch) Vol. 17 Issue 5 Pg. 2 (Dec 2012) ISSN: 1089-1102 [Print] United States
PMID	23373110 (Publication Type: Journal Article)
Chemical References	Analgesics, Non-Narcotic Acetaminophen
Topics	Acetaminophen (therapeutic use) Analgesics, Non-Narcotic (therapeutic use) Dose-Response Relationship, Drug Drug Tolerance Health Behavior Humans Recurrence Tension-Type Headache (drug therapy)

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