1. Drug interactions in gastroenterology: Mechanisms, consequences, and how to avoid 
Laurence J. Egan 
Clinical Gastroenterology and Hepatology 
Volume 2, Issue 9, Pages (September 2004)
DOI: /S (04)00343-X
Copyright © 2004 American Gastroenterological Association Terms and Conditions

2. Figure 1
The omeprazole-itraconazole interaction is caused by a pharmacokinetic mechanism at the level of itraconazole absorption.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

3. Figure 2
The methotrexate-ibuprofen interaction is caused by a pharmacokinetic mechanism at the level of methotrexate excretion.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

4. Figure 3
The cyclosporine-grapefruit juice interaction is caused by a pharmacokinetic mechanism at the level of cyclosporine first-pass metabolism.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

5. Figure 4
The azathioprine-allopurinol interaction is caused by a pharmacokinetic mechanism at the level of azathioprine metabolism.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

6. Figure 5
The warfarin-phenobarbital interaction is caused by a pharmacokinetic mechanism at the level of warfarin inactivation.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

7. Figure 6
The warfarin-aspirin interaction is caused by a combination of pharmacodynamic mechanisms that result in greater anticoagulant effects.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

8. Figure 7
The furosemide-indomethacin interaction is caused by a pharmacodynamic mechanism at the level of renal sodium handling.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions

9. Figure 8
The cause of the selegiline-meperidine interaction is obscure.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04)00343-X)
Copyright © 2004 American Gastroenterological Association Terms and Conditions