The drug should only be used under medical supervision.

这种药须遵医嘱方可使用。

《牛津词典》

However it was done under medical supervision.

但这是在医务监督指导下完成的。

youdao

But, without medical supervision it may not be totally safe.

但是，没有医疗监督可能不完全安全的。

youdao

The National Institutes of Health suggests that women limit their calories to no less than one thousand two hundred calories a day without medical supervision.

VOA: special.2010.06.08

America's National Institutes of Health has suggested that women limit calories to no less than one thousand two hundred calories a day without medical supervision.

VOA: special.2011.07.05

The trainees receive supervision from medical professors and doctors called attending physicians.

VOA: special.2010.07.13

Like all medication it can have side effects, so it should not be used without medical supervision.

BBC: NEWS | Health | Bodybuilders' 'breast drug abuse'

Heitman says he is thankful for the medical supervision he received while on the diet.

CNN: Extreme diets: Life on 800 calories a day

You have to try it (under medical supervision, of course) to find out.

NPR: Excerpt: 'Delivered from Distraction'