Taking Reckweg combination will not slow down the effect of the earlier Homoeopathic medicine that you have been taking.
But if the relief is slow, you should consider getting checked and discussing with doctor again. There are several medicines for gastritis in Homoeopathy. After taking your symptoms in detail a proper medicine can be prescribed that will definitely relieve you.
Next Steps
If you prefer, you can initiate the consultation, we can discuss your problem in detail and start the treatment. The treatment consists of Homeopathic medicines and helpful tips to be followed in daily routine.