> Men who filled metformin prescriptions before or after the three-month period of sperm development did not have offspring with a higher incidence of birth defects, the study found.
"impregnate" is not wrong per-se, but it is weird in placing the emphasis on only one of the two people required. Usually you'd say something like "trying for a child", I believe.
While more study is warranted, I believe the thesis is there is possibly a similar mechanism to how anti parasitics kill parasites during a specific window of their development cycle (with little effect outside of those windows).
