Microval pills are primarily used as a progestogen-only oral contraceptive for the prevention of pregnancy[1][3][5]. Each Microval tablet contains 0.03 mg (30 micrograms) of levonorgestrel, which is a type of synthetic progestogen hormone[3][4][6].
Microval works through several contraceptive mechanisms:
- It makes the cervical mucus impermeable to sperm, thereby preventing sperm from reaching the egg[5].
- It slows the transit of the egg through the fallopian tube[5].
- It induces changes in the endometrium (lining of the uterus) to make it less suitable for implantation[5].
Unlike combined oral contraceptives, Microval does not contain estrogen and thus is considered suitable for individuals who cannot use estrogen-containing contraceptives[1][3]. It should be taken at the same time every day without breaks to maintain its effectiveness. Missing a dose or taking it late by more than 12 hours can increase the risk of pregnancy[3][5].
Microval also has additional medical uses beyond contraception in some cases, but its main indication remains the control of fertility[1][3].
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