Do you give your dog medicine for congestive heart failure every day?

Just found out my 14 yr old schnauzer has congestive heart failure and has to have 2 pills 2 times a day. Vet couldn’t tell me how much time that would give her. Just started dose and will know in 2 weeks if it will help her. If not I will need to have her put down which scares me and breaks my heart. I have never given any dog medicine.