It can be used in the first two weeks for post cycle therapy (pct), as long as you add nolva. Ldex won't help you get things going like nolva will. Pheedno had a very successful post cycle therapy (pct) protocol that was essentially:
Days:
1-30 100mg clomid ED
1-30 20mg nolva ED
1-14 .25mg l-dex ED
31-40 10mg nolva ED