What do you mean “if”? You can take it even without the workouts.
I’m pretty sure you can take creatine regardless of your workout routine, and it’s unlikely to cause any negative effects. Many people find that creatine boosts their muscular energy and endurance. While its primary purpose is to enhance power during lifting, it can also make your arms feel stronger and more revitalized, even with lighter weights.
It’s more effective for heavy lifting than for aerobic or HIIT workouts.
No, you should check the instructions on the bottle first.