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| Impaired absorption | Increased clearance | Increased demand | Most common |
|---|---|---|---|
| Dietary fibre (bread) | Phenobarbital | Pregnancy | Non‐compliance |
| Bile acid sequestering agents | PhenytoinCarbamazepine | Weight gain | |
| Sucralfate | Rifampicin | ||
| Omeprazole | |||
| Soy | |||
| Herbal remedies | |||
| Small bowel disorders |
