有四种药物注册用于治疗昏睡病并免费向疾病流行国家提供。
Four drugs are registered for the treatment of sleeping sickness and provided free of charge to endemic countries.
新药物在临床试验期间接受有限的安全性评估后，即正式注册并投放市场；在大规模普遍使用过程中，只能出现极为罕见的意外的副作用个案。
New medicines are registered and enter the market with limited safety evaluation during clinical trials; rare unexpected side effects can only be detected during large-scale use.
然而即使没有这个专门分类，批准该类知识产权的可能已经引发是否应允许长期使用的药物名称注册商标的激烈争议。
But even in the absence of a dedicated grouping, the prospect of intellectual property approval has sparked a vigorous debate over whether long-used names for the drug can be trademarked.
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