Question 18

Theo is experiencing tolerance.

Tolerance occurs when an individual must consume a larger amount of a substance to achieve the same pleasurable effects previously experienced with a smaller dose. This is a common phenomenon associated with prolonged use of various drugs.

A) tolerance

Tolerance is the correct answer because it directly relates to the need for increased dosage to achieve the same effects. As the body adapts to the presence of the drug, the initial responses diminish, leading to the necessity for higher doses to attain similar levels of pleasure.

B) a drug expectancy effect

A drug expectancy effect refers to the influence of an individual's expectations on their response to a drug, rather than the pharmacological properties of the drug itself. While expectations may play a role in perceived effects, they do not explain the need for increased dosages to achieve the same pleasurable effects.

C) a placebo effect

The placebo effect occurs when a person experiences a perceived improvement in condition due to their belief in the efficacy of a treatment that has no therapeutic effect. This does not relate to the need for higher doses of a drug, as the placebo effect would not require any actual drug consumption to produce results.

D) psychological dependence

Psychological dependence involves a perceived need for a drug to function normally or feel pleasure. While it can be related to increased dosage, it does not specifically explain the requirement for higher amounts to achieve pleasurable effects, which is more accurately described by tolerance.

E) withdrawal

Withdrawal refers to the physical and psychological symptoms that occur when a person reduces or stops using a drug they are dependent on. This is not applicable to Theo's situation, as he is still using the drug and increasing the dose for pleasurable effects, rather than experiencing the negative symptoms associated with withdrawal.

Conclusion

In summary, the correct answer is tolerance, as it accurately describes the phenomenon of needing higher doses for the same effect. Other options fail to capture this specific aspect of drug use, focusing instead on expectations, psychological needs, or withdrawal symptoms, which do not pertain to the requirement for increased dosages.