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Drug Interactions (Types (Pharmacokinetic (Metabolism (Enzyme Inhibitors
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Drug Interactions
Types
-
Pharmacokinetic
Altered Absorption
Tetracyclines and quinolones w/ Ca, Fe, Al
Drugs chelate the metals and are not absorbed
-
Metabolism
Enzyme Inhibitors
- P450
- XO: allopurinol
- Dopa decarboxylase: carbidopa
- Acetaldehyde dehydrogenase: disulfiram,
metronidazole
-
-
-
Diuretics
Potentiate: ACEi, Li, Digoxin
-
-
Important Drugs Metabolised by P450
- Ciclosporin
- OCP
- Epileptic drugs: phenytoin, CBZ
- Statins
- Theophylline
- Warfarin
-
P450 Inducers
- Phenytoin
- Carbamazepine
- Barbiturates
- Rifampicin
- Alcohol (chronic)
- Griseofulvin
- St. John’s Wart
P450 Inhibitors
- Valproate
- INH
- Protease inhibitors
- Cipro, Cimetidine
- Erythromycin + clarithromycin
- Omeprazole
- Grapefruit juice
- Fluconazole / Fluoxetine