Dipyridamole contraindications

Hypersensitivity to dipyridamole, aspirin, or any of the other product components. Allergy Aspirin is contraindicated in patients with a known allergy to NSAIDs and in patients with asthma, rhinitis, and nasal polyps. Aspirin may cause severe urticaria, angioedema, or bronchospasms (asthma). 

Adverse effects with dipyridamole thallium testing are minimal, the main adverse effects being chest pain (with or without ischemic changes on the ECG), headache, dizziness, and nausea. Adverse effects are related to the increased adenosine activity and can be ameliorated by xanthine compounds because they are direct competitive antagonists of adenosine. Caffeine products must be avoided for about 24 hours prior to the test. Adenosine is associated with a higher incidence of adverse effects (80% versus 50%), but these are very transient, and some studies have shown that patients prefer it over dipyridamole. Both agents are relatively contraindicated in patients with a history of bronchospasm. 

Caution must be employed when eptifibatide is used with other drugs that affect haemostasis, including clopidogrel, ticlopidine, dipyridamole, oral anticoagulants or thrombolytics and concurrent or planned use of another glycoprotein Ilb/IIIa inhibitor is contraindicated. ... 

The safety of adenosine in myocardial perfusion testing as an alternative to dipyridamole, which is contraindicated in patients with obstructive airways disease, has been examined in 46 consecutive patients who received intravenous adenosine 140 mg/kg/minute for 4 minutes only 14 complained of chest discomfort and nine had dyspnea none required intravenous aminophylline or resuscitation... 

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