Well one thing I see right off is a bunch of side effects:

More common

Bleeding, blistering, burning, coldness, discoloration of skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site

Incidence not known

Dark urine
fever
inability to move the arms and legs
joint pain
light-colored stools
muscle tenderness, weakness, or pain
nausea and vomiting
skin rash
sudden numbness and weakness in the arms and legs
unusual tiredness or weakness
upper right abdominal or stomach pain
weight loss
yellow eyes and skin

from the Mayo Clinic page on the drug