What to do if I have anxiety, how long before stimulants wear off from preworkout?

Anxiety & stimulants. The length of time stimulants "wear off" depends on which specific medications you're talking about. If you have anxiety, using any stimulants (including over the counter ones) can worsen it. So, i wouldn't recommend using them at all. If you have adhd and are on prescribed stimulants, work with your doctor to alleviate anxiety.