药物疗法的目的是改善病情，防止并发症。
The goal of pharmacotherapy is to reduce morbidity and to prevent complications.
而慢作用药有改善病情的作用，因此在阻止病情进展方面应该用此类药物。
And the slow-acting drug to improve disease and therefore in the progress of the disease should stop using these drugs.
虽然在家时，他已服了抗疟疾药物，但病情并无改善。
He had taken antimalarial medication at home, but his condition did not improve.
虽然在家时，他已服了抗疟疾药物，但病情并无改善。
He had taken antimalarial medication at home, but his condition did not improve.
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