Drug Interactions between acetaminophen and Ultrase MT 20

GENERALLY AVOID: Chronic, excessive consumption of alcohol may increase the risk of acetaminophen-induced hepatotoxicity, which has included rare cases of fatal hepatitis and frank hepatic failure requiring liver transplantation. The proposed mechanism is induction of hepatic microsomal enzymes during chronic alcohol use, which may result in accelerated metabolism of acetaminophen and increased production of potentially hepatotoxic metabolites.

MANAGEMENT: In general, chronic alcoholics should avoid regular or excessive use of acetaminophen. Alternative analgesic/antipyretic therapy may be appropriate in patients who consume three or more alcoholic drinks per day. However, if acetaminophen is used, these patients should be cautioned not to exceed the recommended dosage (maximum 4 g/day in adults and children 12 years of age or older).

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MONITOR: Exogenous pancreatic enzymes may interfere with the gastrointestinal absorption of folic acid and iron. The exact mechanism of interaction is unknown. In one study, investigators compared oral iron absorption over a 3-hour period in the presence and absence of exogenous pancreatic enzymes in 13 stable young adults with cystic fibrosis and 9 age-matched controls. There was no difference between patients and controls in iron absorption in the absence of exogenous pancreatic enzymes. However, significant impairment of iron absorption was observed in both groups after administration of pancrelipase one hour prior to iron administration. In the patient group, one hour after iron administration, there was a 188% increase in serum iron level above baseline in the absence of pancrelipase but only a 62% increase in the presence of pancrelipase. In the controls, percentage increases as well as peak serum iron levels were significantly higher in the absence of pancrelipase during all 3 hours after iron administration. Clinically, at least one-third of cystic fibrosis patients reportedly have iron deficiency. In the study, mean serum iron concentration was significantly lower in patients than in controls (11.9 versus 18.9 micromoles/L), and 5 of the patients but none of the controls had a serum iron concentration lower than 9 micromoles/L at baseline, presumably due to long-term treatment with pancreatic enzyme supplements.

MANAGEMENT: Patients receiving therapeutic iron or folate therapy should be monitored for potentially reduced hematologic response if pancreatic enzymes are administered concomitantly. Separating the times of administration may be helpful.

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