Ammonium carb 200C liquid is an effective homeopathic medicine acts as a stimulant, produces perspiration and has cough expectorant property. It increases the alkalinity of blood and reduces tendancy of coagulation. It is very much useful to treat nasal catarrh. Treats loss of breath while falling asleep. Also cures the ulcerations that can become gangrenous especially the tonsils. Night stoppage of mouth which leads a person to breathe through the mouth can also be treated. Dosage depends on the condition, age, sensitivity and many other things so take the dose as directed by your doctor.