flash in the pan
someone or something that makes a flashy start and then fails
The man's sports career was a flash in the pan. Recently, I have not heard anything about him.
Precaution while using Homeopathy
Never go beyond the suggested deadline
Never go beyond the suggested deadline before you visit or write to your doctor. If the doctor has asked you to take the medicine for 15 days and report later, you must do it soon. If you cannot report after 15 days, you may stop your medicine before you report to him but do not continue the same medicine beyond stipulated time period.