Agar Sahi samay

Agar sahi samay par iska prayog nahi kiya jaye (Youn sambandh banane ke 72 hour ke andar) to yeh asar nahi karti hai. Inn dawao ka adhik prayog karne se banjhpan ki samasya bhi ho sakti hai. Isliye prakritik garbh nirodhak ko janm par niyantran ke liye sabse behtar tarika mana jata hai.