suppositories work very well with small babies who will not or cannot take oral medicine.
When dd2 was unconcious having a febrile convulsion, a paracetamol suppository was the only why I could get paracetamol into her, to bring her temperature down and stop the convulsion. By the time she was in the ambulance, her temperature had lowered from more then 40°C to 38°C, and she was regaining conciousness, due to the suppository.
Thery are very widely used in Belgium. They do not cause psycholgical trauma, unlike the first time I tried to give DD1 oral medicine and she choked on it, and got very distressed.
I have used motilium suppositories against vomiting, when oral medication does not stay down.