Final answer:
A synergistic drug enhances the effects of another drug. Examples of drug interactions include agonistic drugs that facilitate neurotransmitter activity and antagonistic drugs that inhibit these effects, which can result in various therapeutic outcomes.
Step-by-step explanation:
The drug that enhances the effects of another drug is known as a synergistic agent. Synergistic interactions increase the efficacy or toxicity of drugs when used together compared to when each drug is used separately. Plagiarism free content requires that you write in your own words and avoid copying from other sources without attribution, ensuring that the explanations and examples are crafted originally.
Agonistic drugs, such as those used to treat Parkinson's disease, mimic the effect of neurotransmitters, while antagonistic drugs inhibit these effects. Within psychoactive drug interactions, an agonist, like cocaine when it increases dopamine levels, would enhance neurotransmitter activity. Meanwhile, antagonistic drug interactions, which could involve certain antimicrobials and antacids, may decrease the effectiveness of drugs or produce harmful effects.