c an this be used with oxygen

Allium Cepa (onion extract) tablets are a homeopathic treatment for allergies. My wife suffered for many years and could only control her allergies by injection. Allium Cepa tablets proved to be an effective cure which are also used by our two daughters again with similar results. I am not a clinician but I would not think that there should be any contraindications between Allium Cepa and a patient using Oxygen.

How many hours apart do you take the five pill?

I take one dose per the instruction. After that, I'm good. Remember, everyone reacts differently. If you have doing questions you should find a qualified homeopathic practitioner and talk to them.

It is liquid or tablet

It’s not a liquid but a very small bead.

What does it mean 12c, 30c or 6c?

Those numbers represent dosage. 30c is most common. the lower the number the more frequently you can take it, however, it is less potent. 200c is one you may take one time a week for a more potent dosage.