Hi.
Thanks for your query.
Noted the history of ersive 
gastritis for which you were prescribed Darolac capsules.
You have a stock of expired medicines brought from India.
Well, Darolac is not given for erosi be gastritis but is given for 
colitis and bacterial flora disturbance.
If you do not have any symptoms then you do not need any medications.
The expired medicines stock should not be used and disposed properly.
If you have any symptoms, please consult the local Doctor for clinical evaluation, examination, investigations and proper prescription based treatment.
Take care about what you eat and drink.
Soft bland diet.
If any burning pain in upper abdomen, try  PPI like 
Omeprazole, antacids and supportiveedication.