I would be able to help if you had a picture of it up
No you shouldn't mainly because it is not in your scope of practice. there will be legal consequences if you are caught and you are not licensed to administer medication
The effects of marijuana can last up to 48 hours
EXACERBATION of side effects. You get double the side effects of sleepiness, dullness, dry mouth and impaired judgement. It is better to take an antihistamine alone or a cold medication preparation, which contains this. Do not take both. Also, take it at bedtime, so that it would help by causing sleepiness.
