The most common adverse effects are associated with its vasodilator action and often diminish on continued therapy. They include dizziness, flushing, headache, hypotension, peripheral edema, tachycardia and palpitations. Nausea and other gastrointestinal disturbances, increased micturition frequency, lethargy, eye pain, and mental depression have also occurred. A paradoxical increase in ischaemic chest pain may occur at the start of the treatment and in a few patients excessive fall in blood pressure has led to cerebral or myocardial ischaemia or transient blindness. There have been reports of rashes (including erythema multiforme), fever, and abnormalities in liver function, including cholestasis, due to hyperplasia, myalgia, tremor and impotence have been reported.
Overdose maybe associated with bradycardia and hypotension.
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