Forgot to give my dog a medicine

Hello, what should I do if I've forgotten to give my dog her scheduled medicine? Her scheduled medicine is twice a day for 7 days—3.5 ml of Cefalexin monohydrate. There was a day that I only gave her medicine once instead of twice.

It sounds as though you have missed a single dose of an antibiotic course.   Do not try to make up for this at the next dose point;  rather call your vet who prescribed the tablets and take their advice from here.

Oooops - typo.  I apologise and will rewrite for clarity.

Is sounds as though you missed a single dose of an ANTIBIOTIC course.   Do not try to make up for this by doublimg at the next dose point.   Rather, call your vet who prescribed the tablets or their emergency cover (you will however by low priority for this and may have to wait if they are busy).   You should take their advice from there.