Deca Durabolin 100mg is given by injection into a vein, muscle, joint or wound of the skin, as prescribed by your doctor. Follow your doctor’s instructions carefully. The amount not specified depends on your medical condition and response to treatment. Do not increase your dose or use this medication much more than prescribed without consulting your doctor.Some patients (especially newborns) should receive the type of this drug without preservatives. In these patients, once you have mixed this type of medicine, you must use an IV fluid that is jointly free of preservatives. Use these mixtures within twenty-four hours.