Arousal level changes the EEG, but this is patient dependent (I.e. a stimulation medication will increase alpha levels in an under aroused subject, but will decrease alpha in an over aroused (anxious) subject .<br><br>There is a reciprocal relationship
between alpha and beta. If a drug stimulates the brain stem and alpha generators lose their synchronicity, beta appears in the EEG. There are five classes of drugs that have effects on EEG:

<br><br>
<ul>
    <ul>
        <li>Street Drugs</li>
        <li>Anti-epileptic drugs/anti-convulsant drugs</li>
        <li>Analgesics (includes opioids)</li>
        <li>Anesthetics</li>
        <li>Psychotropics</li>
    </ul>




</ul>

GABAergic drugs create the greatest changes (benzodiazepines and barbiturates)