Difficulty: Easy

Average Score: 75%

A 25-year-old woman presents with schizophrenia-like symptoms caused by a drug. Which drug class is most likely responsible?

Rationale

A dopamine agonist, such as amphetamine.

Dopamine agonists, like amphetamines, can induce schizophrenia-like symptoms by increasing dopamine activity in the brain, which is associated with psychotic experiences. This overstimulation can lead to hallucinations, delusions, and other cognitive disturbances that resemble those found in schizophrenia.

A (An opioid antagonist, such as naloxone) YOUR ANSWER

Opioid antagonists like naloxone work by blocking opioid receptors and are primarily used to reverse opioid overdoses. They do not typically cause schizophrenia-like symptoms, as they do not impact dopamine pathways, which are crucial in the development of psychotic symptoms.

B (A dopamine agonist, such as amphetamine) CORRECT

As previously mentioned, amphetamines increase dopamine levels and stimulate dopamine receptors, leading to symptoms akin to schizophrenia. This drug class is well-documented for its ability to induce psychosis, making it the most likely cause of the symptoms in this scenario.

C (Birth-control pills with estradiol) YOUR ANSWER

While hormonal changes can influence mood and behavior, birth-control pills containing estradiol are not commonly associated with inducing schizophrenia-like symptoms. Their primary function is regulating reproductive hormones, rather than affecting dopamine pathways significantly.

D (An antipsychotic that is a dopamine antagonist) YOUR ANSWER

Antipsychotics that act as dopamine antagonists are used to treat schizophrenia and psychosis, not cause it. These medications work by reducing dopamine activity, countering the symptoms of schizophrenia rather than producing them.

E (An herbal supplement with oxytocin) YOUR ANSWER

Oxytocin is linked to social bonding and emotional regulation, but it does not typically induce schizophrenia-like symptoms. Its effects are more related to enhancing social behaviors rather than causing psychotic features.

Conclusion

In summary, amphetamines, as dopamine agonists, are the drug class most likely responsible for inducing schizophrenia-like symptoms due to their enhancement of dopamine activity in the brain. Other options either do not affect dopamine pathways or are used to treat, rather than cause, psychosis. Understanding these drug classes is essential for effective diagnosis and treatment of drug-induced psychotic disorders.

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