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Thromb Haemost 2016; 115(05): 905-910
DOI: 10.1160/TH15-11-0882
DOI: 10.1160/TH15-11-0882
Current Controversies
Vorapaxar and diplopia: Possible off-target PAR-receptor mismodulation
Further Information
Publication History
Received:
17 November 2015
Accepted after major revision:
05 January 2016
Publication Date:
06 December 2017 (online)
Summary
Vorapaxar, a novel antiplatelet thrombin PAR-1 inhibitor, has been evaluated in the successful TRA2P trial and the failed TRACER trial. The drug is currently approved for post myocardial infarction and peripheral artery disease indications with concomitant use of clopidogrel and/or aspirin. The FDA ruled that the vorapaxar safety profile is acceptable. However, both trials revealed excess diplopia (double vision) usually reversible after vorapaxar. The diplopia risk appears to be small (about 1 extra case per 1,000 treated subjects), but real. Overall, there were 10 placebo and 34 vorapaxar diplopia cases (p=0.018) consistent for TRACER (2 vs 13 cases; p=0.010) and for TRA2P (8 vs 21 cases; p=0.018). Hence, we review the FDA-confirmed evidence and discuss potential causes and implications of such a surprising adverse association, which may be related to off-target PAR receptor mismodulation in the eye.
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