Hi, I think this depends on the pharmacokinetic and dynamic of the drug that you are trying. So if the drug's action is quick enough then perhaps you administer them together, but if the drug takes some time to start working, then perhaps it is better that you administer it before the OGTT.

Hope that makes sense. All the best Keagile Bati

Thank you Hussain Alsaffar it makes sense but what if you do not know its phamarcokinetic or dynamic properties ie in the case of a crude extract?

Then perhaps you need to try both ways!