Not heard of medication you are taking but a good source of advice can be given by your pharmacist. Have a chat with them about it. They will definitely know if there is a similar medicine available.
I used to have horribly blocked sinuses (for years). If they ever became sore I would check with my GP in case I had an infection and needed antibiotics. And if you do need to stop your nasal spray as the ingredients are now causing problems/side effects rather than an infection, then your doctor can consider an alternative medication such as Montelukast or a prescribed antihistamine, which can be taken orally.
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