In amoebic dysentery, warm injections of quinine per rectum have proved very efficacious, are usually well tolerated, and are not attended with any ill effects.
No one can tell the physical difference until the injections wear off.
The pain can be lessened by injections of morphia.
Injections are not appealing to many people and they are not likely to be necessary in most cases.
And there is nothing hidden in these injections that will alert your kind?