(1) Before prescribing any drug known to cause any adverse reaction, the doctor should make a reasonable effort to determine if any adverse reaction is likely to occur.
(2) Sensitivity tests should be done before injecting preparations which are likely to
produce anaphylactic shock.
(3) The doctor should warn the patient of side-effects particularly possible drowsiness or similar accident-producing, reaction, which may occur while he is taking the drug.
(4) The doctor should inform the patient about the possibilities of permanent side-effects.
A physician is not liable for injuries resulting from adverse reaction to drug unless some negligence on his part contributed to cause the injury, however in the above question,it was the fault of the doctor for not doing the sensitivity tests,therefore the physician is liable.