Time commitments vary with the drugs under study. Some studies require an entire day in the company's offices; others allow participants to return home immediately after taking the drug, then have them return at regular intervals for blood tests.
而依據藥品的不同，試驗時間有所不同；有的要在公司辦公室待一整天接受觀察，有的是吃了藥之後即可回家，再定期回公司抽血即可。