At this stage, the drug produces no more depressive effects. Morphine has different effects at various concentrations

The depressive curve is used to show the bad effect of morphine.

It shows the concenrtaion of morphine over time before it becomes toxic to the user. The margin of safety should be large to avoid toxicity / poisoning.

What is a margin of safety?

It is the distance between the desired effect and the toxic effect. Shibamoto and Bjeldanes (2009) defined safety as the freedom from danger.

Why is a bigger margin of safety better than a small one?

A bigger margin of safety is better since it will mean that the drug user would niot easily or accidentally experience the toxic effects of the drug.

Explain why each of the lines flatline at the top and why the second line also flatlines to begin with.

The flat lines that are observed...
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