Does thc blocks straterra?

Yes and no: They work on 2 different systems in the brain. So one does not block the other bt straterra is for learning and memory. Thc destroys ones ability to learn and remember. So in a way the answer is yes, but not as a blocker as a doctyor would describe a blocker.

No: Thc does not directly block straterra, but it sure can create problematic symptoms like paranoia, disorientation, and psychosis. Sometimes these continue after you stop using the drug. Most people take straterra for focus and concentration, and thc is a hallucinogen that leads away from concentration. Why would you want to combine them? Not a good plan.