Deca Durabolin use should not be initiated by pregnant or breastfeeding women or those having an existing allergy to Deca Durabolin or any of its ingredients. Deca, when taken in high doses, can accelerate epiphyseal closure and induce hypercalcaemia and hypercalciuria in acute cases. The doses of Deca Durabolin should ONLY be increased or decreased with a medical consent. Medical intervention should be sought at the earliest and use of the steroid should be discontinued immediately in case you experience any abnormality after using Deca.