Research-use-only compounds have no interaction data of any kind, because interaction studies are done on medicines being developed for use in people.
Follow-up: Oral contraceptives and delayed emptying: what the data shows
Coming back to post #12, because the follow-up matters more than the original answer.
Oral contraceptives and delayed emptying is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Speaking only to Oral contraceptives and delayed emptying as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the variance between people is larger than the effect.
The arithmetic in post #34 is right; the assumption feeding it is the part to check.
Oral medications with a narrow therapeutic index are the ones where that matters most. The interaction is about rate and timing rather than about the total absorbed, in most published cases.
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