This study is an international multi-centre prospective randomized single-blind blinded-endpoint parallel-group partial-factorial controlled trial of transdermal glyceryl trinitrate ( a nitric oxide donor , given for seven-days ) vs. no glyceryl trinitrate , and of continuing vs. stopping ( temporarily for seven-days ) pre-stroke antihypertensive drugs if relevant , inpatients with acute ischaemic stroke or intracerebral haemorrhage and high systolic blood pressure ( 140220 mmHg ) .