Nitrofurantoin Drug Interactions
Known drug interactions from FDA labeling • Also known as: Nitrofurantoin
Drug Interactions
7 DRUG INTERACTIONS Antacids : Decreased absorption of nitrofurantoin. (7.1) Uricosuric drugs: Inhibit renal tubular secretion of nitrofurantoin. (7.2) 7.1 Antacids Antacids containing magnesium trisilicate, when administered concomitantly with nitrofurantoin, reduce both the rate and extent of absorption. The mechanism for this interaction probably is adsorption of nitrofurantoin onto the surface of magnesium trisilicate. If coadministration of nitrofurantoin with antacids containing magnesium trisilicate cannot be avoided, monitor for lack of efficacy [see Clinical Pharmacology (12.3)] . 7.2 Uricosuric Drugs Uricosuric drugs, such as probenecid and sulfinpyrazone, can inhibit renal tubular secretion of nitrofurantoin. The resulting increase in nitrofurantoin serum levels may increase toxicity, and the decreased urinary levels could lessen its efficacy as a urinary tract antibacterial. Therefore, monitor for nitrofurantoin adverse reactions when co-administering nitrofurantoin with uricosuric drugs. 7.3 Drug Interference with Laboratory Tests The presence of nitrofurantoin can cause a false-positive reaction for glucose in the urine when using Benedict's or Fehling's copper reduction reaction to determine the amount of reducing substances like glucose in the urine. Use glucose tests based on enzymatic glucose oxidase reactions to detect glucose in the urine.
Contraindications
4 CONTRAINDICATIONS Nitrofurantoin is contraindicated in: patients with known hypersensitivity to nitrofurantoin [see Warnings and Precautions (5.1)]. patients with a previous history of cholestatic jaundice/hepatic dysfunction associated with nitrofurantoin [see Warnings and Precautions (5.3)]. patients who have anuria, oliguria, or significant impairment of renal function (creatinine clearance under 60 mL per minute or clinically significant elevated serum creatinine) due to an increased risk of toxicity resulting from impaired excretion of the drug [see Warnings and Precautions (5.4)]. pregnant patients at term (38 weeks to 42 weeks gestation), during labor and delivery, or when the onset of labor is imminent and in pediatric patients younger than 1 month of age because of the possibility of hemolytic anemia due to immature erythrocyte enzyme systems (glutathione instability) [see Warnings and Precautions (5.5) and Use in Specific Populations (8.1 and 8.4)]. Known hypersensitivity to nitrofurantoin. (4) History of cholestatic jaundice/hepatic dysfunction associated with nitrofurantoin. (4) Patients who have anuria, oliguria, or significant impairment of renal function (creatinine clearance under 60 mL per minute or clinically significant elevated serum creatinine). (4) Pregnant patients at term (38 weeks to 42 weeks gestation), during labor and delivery, or when the onset of labor is imminent. (4) Pediatric Patients under one month of age. (4)
View full Nitrofurantoin information including side effects, dosage, and warnings.
Why are drug interactions dangerous?
Drug interactions can cause medications to be less effective, increase side effects, or produce new harmful effects. Some interactions can be life-threatening. Always tell your doctor and pharmacist about all medications, supplements, and herbal products you take.