It should be used within 1 month as advised by doctor . Even the tapering dose ( reduced dose) has to be followed as per instructions of the doctor.
On all Eye drops ,inside there is always a small paper in which they always mention that. But mostly patients do not see that paper inside the eye drops.
Health Tips
Never use over the counter drugs( medicines,eye drops etc )without consulting a doctor. Nor continue medicines if there is any recurrence of infection without doctors suggestion.
Because we see lot of complications due to continuous usage of drugs/medicines .
There is always a reason why we keep drugs/medicines in tapering dosage after seeing patients in person.