Whatever happens, never take an overdose of this medicine.

这种药千万不能服过量。

《新英汉大辞典》

He instead blamed his bumbling and at times incomprehensible performance on an overdose of cold medicine.

相反，他将自己讲话含糊、不时做出匪夷所思举动的表现归咎于过量服用感冒药。

youdao

Sugar is slower to impact our health (as we don't die from an overdose right away), and it's that slow destructive process that is the most dangerous.

糖对我们健康的影响是慢性的(就像我们不会因一次过量摄入而马上死亡一样)，而其实慢性损伤是最危险的。

youdao

But these may not develop for two or three days after an overdose too late to prevent damage.

VOA: special.2009.07.08

Symptoms of an overdose include rapid heartbeat, heart failure, shortness of breath, unconsciousness and coma.

BBC: Factfile on drugs

She also took an overdose of medication last week for which she needed hospital treatment.

BBC: Anger at ex-royal aide's escape

An overdose may produce slow and shallow breathing, clammy skin, convulsions, coma and death.

CNN: Heroin use on the rise