<p>The following side effects have been reported at the approximate frequencies shown:</p>

<ul>
	<li><strong>Very common</strong>: dry mouth, drowsiness</li>
	<li><strong>Common</strong>: headache, dizziness (vertigo), flushing (vasodilation), weakness or loss of strength, confusion, sleep disturbances, nausea (feeling sick), being sick (vomiting), stomach upsets (dyspepsia), diarrhoea, rash or itching (pruritus), back pain</li>
</ul>