Abstract
Effects of repeated daily administrations of cocaine on blood pressure and heart rate were studied in conscious rats. Cocaine (0.03–3.0 mg/kg i.v.) increased blood pressure and heart rate the first time it was administered (day 1) However, the magnitude and duration of the increases in blood pressure caused by cocaine (0.1–3.0 mg/kg) dramatically increased on day 2 and remained (except 1.0 mg/kg dose) at these levels through day 5. Following two drug-free days (days 6 and 7), the increase in blood pressure caused by cocaine (0.1, 0.3 and 3.0 mg.kg) on day 8 was still elevated. Unlike blood pressure, no enhancement in heart rate response to cocaine was observed.
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