Final answer:
Lithium is safe to combine with MAOIs, while combining MAOIs with meperidine, levodopa, SSRIs, or epinephrine can be dangerous. Epinephrine is the drug used for anaphylactic shock.
Step-by-step explanation:
The question asks which substance is safe to combine with monoamine oxidase inhibitors (MAOIs). Among the options provided, Lithium is considered safe to use in combination with MAOIs. It is crucial to avoid combining MAOIs with substances that can lead to severe interactions such as serotonin syndrome, hypertensive crisis, or other adverse effects. For instance, combining MAOIs with meperidine, levodopa, selective serotonin reuptake inhibitors (SSRIs), or a spinal anesthetic containing epinephrine is unsafe and can lead to serious complications.
In the context of emergency medical treatment, epinephrine is typically used to counteract the effects of anaphylactic shock. It is the primary drug administered during anaphylactic reactions to rapidly reverse the severe allergic responses.