Caffeine is an excito-toxin. This means it causes brain cells to become excited or so active that they become damaged. For a long time, the rule of thumb was 'no caffeine.' Recent research has shown that a single cup of coffee or its equivalent of caffeine, is OK and may even be beneficial to the injured brain.

With the problem with anxiety many with PCS have, caffeine is contra-indicated. It is especially contra-indicated to overcome the sleepiness caused by some medication. I was read the riot act when I told my doctor I was using caffeine to help with the sleepiness from the anti-convulsant I was taking.

The same rule applies to alcohol. Until recently, No alcohol was the rule. Now, researchers suggest a single serving of wine or beer per day is OK and may have some beneficial effects. The relaxation effects of an alcoholic drink may be the objective.