Onjel 20 mcg is a type of hormonal birth control that helps prevent pregnancy. voveran emulgel 30 gm diclofenac It contains the hormone ethinyl estradiol, which works by stopping ovulation. Taking Onjel 20 mcg consistently each day can also modify cervical mucus to make it harder for sperm to reach an egg and may thin the lining of the uterus, maki