患者，男，20岁。牙龈出血、四肢瘀点、乏力2个月。贫血貌，四肢多处出血点、瘀点，色暗淡，针尖样大小，压之不褪色。神情倦怠，气短，头晕，食欲不振，面色萎黄，舌质淡，苔白，脉弱。白细胞计数6.7xlO9/L，红细胞5.3xl09/L，血红蛋白70g/L，血小板计数24X10g/L。骨髓检查：巨核细胞数目增多。抗血小板抗体阳性。该患者的首选方药是

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