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<p>pages.</p>

<p><big>Drugs used to increase alertness</big></p>
<p>The <a href="page.php?w=stimulant">stimulant</a> and <a href="page.php?w=adenosine_receptor_antagonist">adenosine receptor antagonist</a> <a href="page.php?w=caffeine">caffeine</a> is widely used to increase alertness or <a href="page.php?w=wakefulness">wakefulness</a> and improve <a href="page.php?w=Mood_%28psychology%29">mood</a> or <a href="page.php?w=performance-enhancing_substance">performance</a>. People typically self-administer it in the form of drinks like <a href="page.php?w=green_tea">green tea</a></p><p>
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