Heard of this medicine for the first time...
I want to know the quantity dosage of it that is more suitable for it's patient...!

Coenzyme Q10 (CoQ10), also known as ubiquinone and ubidecarenone, is often described as a vitamin or at least a vitamin-like substance. However, it is not strictly a vitamin as it can be synthesised in the liver. CoQ10 is synthesised from the amino acid tyrosine (this synthesis in turn requires other vitamins and minerals) but is also absorbed from a wide variety of foods.

As with other vitamins and dietary supplements the strongest case for use can be made in conditions where deficiency is associated with disease and where supplementation corrects or prevents the disease. It is more difficult to establish benefit in health maintenance and disease prevention. In common with other naturally-occurring antioxidant compounds, many claims are made for benefit through antioxidant activity.

Since the 1980s it has been possible to measure normal blood and tissue levels of CoQ10. It has thus been possible to define deficiency of CoQ10 and possible associated disease. Deficiency can arise through:
Reduced biosynthesis
Increased utilisation
Reduced dietary intake
A combination of these factors (probably most often the cause)
There is now a lot of interesting research being done on CoQ10. There are a number of interesting therapeutic possibilities. At the moment there is evidence to suggest possible benefit from supplementation but perhaps not enough for firm recommendations. Some enthusiasts are keen to recommend taking supplements and it is helpful to acquire background knowledge to understand the basis for these recommendations. Supplementation appears to be safe.