DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.13d.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ1.13d.ii |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | d.ii | Adapted from | N/A |
d.ii.
[Maximum mark: 1]
18M.3.sl.TZ1.13d.ii
Many drugs, including aspirin, penicillin, codeine and taxol, have been modified from compounds that occur naturally.
(d.ii)
Suggest one reason why codeine is more widely used than morphine as an analgesic.
[1]
Markscheme
codeine has a wider therapeutic window
Accept “codeine has lower activity” OR “codeine has lower risk of overdose” OR “codeine is less potent” OR “codeine has less side-effects”.
Do not accept “lower abuse potential for codeine” OR “less addictive «than morphine»” OR “codeine has a lower bioavailability” OR “available without prescription” OR “cheaper”.
[1 mark]
