A patient informs you that she has been taking more phenobarbital than the doctor prescribed because the amount that he prescribed was not helping her sleep. She also says that when she does not take the drug, she becomes very anxious, has tremors, and feels like she is being watched. Using your knowledge of sedative-hypnotic drugs, explain to this patient that she has developed a physical dependency on phenobarbital.
A. The anxiety, tremors, and paranoid behavior are signs of withdrawal which occurs when a patient has taken larger than therapeutic dosages for more than 1 to 2 months.
B. The anxiety, tremors, and paranoid behavior are completely unrelated to the use of phenobarbital.
C. The anxiety, tremors, and paranoid behavior are normal with the use of phenobarbital.
D. None of the above are correct.
Answer: A
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Which structure regulates the amount of light entering the eye?
a. ciliary body c. pupil b. lens d. rod