Sometimes zymaxid is used to treat bacterial conjunctivitis or pink eye. A generic version of zymaxid may be available in the future, Allergan, the makers of zymaxid, will lose their patent in 2016 and then the active ingredient called gatifloxacin would be the generic equivalent eye drops. Read more about generic zymaxid drops.
The longer answer is that vitamins, especially the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, Vitamin B6, biotin, and folic acid) do contribute to energy metabolism, by helping your body turn carbohydrates, proteins, and fats into utilizable energy.
There could be many reasons for this fatigue problem and if you can overcome it you should feel a lot better. A B50 or B100 is a very potent vitamin B complex including lots of vitamin B12 (the energy vitamin) and that should boost your energy level. You could also take a high potency energy multivitamin that also includes lots of vitamin B12. If you take vitamin B12 alone you are likely to create an imbalance with the other B vitamins which all interact so the B complex or a multivitamin is better than vitamin B12 alone. Coenzyme Q10 is a good energy enzyme to take. It also slows down the aging process.