What is the onset of chloral hydrate?

Prepare for the American Board of Pediatric Dentistry Oral Boards. Utilize flashcards and multiple-choice questions with hints and explanations to ace your exam!

Multiple Choice

What is the onset of chloral hydrate?

Chloral hydrate given by mouth acts as a slow-absorbing oral sedative. It must be absorbed from the gastrointestinal tract and metabolized in the liver to its active form, which takes time to produce noticeable calming effects. Because of this absorption and metabolism, the onset is typically about 30–60 minutes, with the peak effect occurring a bit later and sedation lasting for several hours. If the patient is not fasting, absorption can be a bit slower, and fasting can bring the onset closer to the earlier end of that window. This makes 30–60 minutes the best match for when the sedative effects begin. Rapid onset on the order of a few minutes would be more typical of IV or inhaled sedatives, while 2–3 hours would be unusually delayed for an oral agent. A 10–20 minute onset is shorter than expected for an oral preparation like chloral hydrate.

Chloral hydrate given by mouth acts as a slow-absorbing oral sedative. It must be absorbed from the gastrointestinal tract and metabolized in the liver to its active form, which takes time to produce noticeable calming effects. Because of this absorption and metabolism, the onset is typically about 30–60 minutes, with the peak effect occurring a bit later and sedation lasting for several hours. If the patient is not fasting, absorption can be a bit slower, and fasting can bring the onset closer to the earlier end of that window. This makes 30–60 minutes the best match for when the sedative effects begin.

Rapid onset on the order of a few minutes would be more typical of IV or inhaled sedatives, while 2–3 hours would be unusually delayed for an oral agent. A 10–20 minute onset is shorter than expected for an oral preparation like chloral hydrate.

More practice questions