Giving medication to pets is not always easy: compliance with your vet’s instructions can be challenging.
In a typical case of a dog with a skin condition, I may send the owner home with three types of tablets to be given twice daily for ten days. As I write up the final details of the patient’s file, I sometimes reflect that I have sent the owner away with a challenging task to complete.
When vets give medicines, we often use the easy route of giving an injection, usually into the skin at the back of the neck. Most animals do not even notice this happening, since the skin in this area is loose, with insensitive innervation. Long acting injections are sometimes available, such as an antibiotic that lasts for two weeks, or a steroid that lasts for a month, but these drugs are only effective for particular cases. In most instances, ongoing medication has to be given by owners at home, and this is usually via the oral route, using tablets or capsules.
Please note that I am unable to answer veterinary questions in comments. If you have questions or concerns about your pet's health it is always better to contact your vet.