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Which of the following drugs decreases theophylline clearance ?

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Usual doses of erythromycin, propranolol and isoprenaline , a reduction of about 25% is needed; with cimetidine and oral contraceptives by about 30% or more to level the theophylline normal clearance.

D, IV isoproterenol

Thanks Dr Dinesh Gupta
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E all of above risk more with Isiproterenol

SUGGESTIVE. OF .. E.. ALL. OF. THE ABOVE

D.iv.isoproteremol

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