Indications

Oral contraceptives are indicated for the prevention of pregnancy in women who elect to use this product as a method of contraception. Oral contraceptives are highly effective. The efficacy of these contraceptive methods, except sterilization, the IUD, and implants depends upon the reliability with which they are used. Correct and consistent use of methods can result in lower failure rates.

Pharmacology

Combination oral contraceptives (COC) act by suppression of gonadotropins. Although the primary mechanism of this action is inhibition of ovulation, other alterations include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation).

Dosage And Administration

To achieve maximum contraceptive effectiveness, Norgestrel & Ethinyl Estradiol and ferrous fumarate must be taken exactly as directed and at intervals not exceeding 24 hours. The possibility of ovulation and conception prior to initiation of medication should be considered. The dosage of Norgestrel & Ethinyl Estradiol and ferrous fumarate is one white tablet daily for 21 consecutive days, followed by one brown tablet daily for 7 consecutive days, according to prescribed schedule. It is recommended that tablets be taken at the same time each day.

Interaction

Reduced contraceptive effectiveness with antibiotics, anticonvulsants and drugs that may increase contraceptive steroids clearance (e.g. bosentan, rifampicin, rifabutin, barbiturates, primidone, phenytoin, carbamazepine, oxcarbazepine, topiramate, griseofulvin, aprepitant). Severe pruritus and jaundice with troleandomycin, avoid concurrent use. Decreased effectiveness of ursodeoxycholic acid by increasing the elimination of cholesterol in bile. Effects of danazol or gestrinone and hormonal contraceptives might be altered or reduced by concurrent use, avoid concomittant use.

Decreased contraceptive effectiveness with anti-HIV protease inhibitors. Increased tacrolimus levels with ethinyl estradiol. May increase theophylline, selegiline and tizanidine levels with oral contraceptives.

Contraindications

Pregnancy, undiagnosed vaginal bleeding, severe arterial disease (or family history of atherogenic lipid profile); liver adenoma; porphyria; after evacuation of hydatidiform mole; history of breast cancer; hepatic impairment; thrombophloebitis or thromboembolic disorders; breast carcinoma except in selected patients being treated for metastatic disease; oestrogen-dependent tumour; smoking >40 cigarettes daily; >50 yr; diabetes complications present; BMI >39 kg/m2; migraine with typical focal aura, lasting >72 hr despite treatment or migraine treated with ergot derivatives; BP >160 mmHg systolic and 100 mmHg diastolic; transient ischaemic attacks without headaches; SLE; gallstones; history of haemolytic uraemic syndrome, pruritis during pregnancy; cholestatic jaundice; chorea or deterioration of otosclerosis pemphigoid; breast feeding during 1 st 6 mth after delivery.

Side Effects

Edema, Weakness, Amenorrhea, Breakthrough bleeding, Change in menstrual flow, Spotting, Anorexia, DVT, Thrombophlebitis, Depression, Dizziness, Headache, Nervousness, Somnolence, B reast tenderness, Galactorrhea, Abdominal pain, Nausea, Vomiting, Change in weight, Cholestatic jaundice.

Pregnancy And Lactation

Extensive epidemiological studies have revealed no increased risk of birth defects in infants born to women who have used oral contraceptives prior to pregnancy. Studies also do not suggest a teratogenic effect, particularly insofar as cardiac anomalies and limb-reduction defects are concerned, when taken inadvertently during early pregnancy

The administration of oral contraceptives to induce withdrawal bleeding should not be used as a test for pregnancy. Oral contraceptives should not be used during pregnancy to treat threatened or habitual abortion. 

It is recommended that for any patient who has missed two consecutive periods, pregnancy should be ruled out before continuing oral-contraceptive use. If the patient has not adhered to the prescribed schedule, the possibility of pregnancy should be considered at the time of the first missed period. Oral-contraceptive use should be discontinued if pregnancy is confirmed.

Precautions And Warnings

Sex-steroid dependent cancer; past ectopic pregnancy; malabsorption syndromes; functional ovarian cysts; active liver disease, recurrent cholestatic jaundice, history of jaundice in pregnancy; history of CV or renal impairment; DM; asthma; epilepsy; migraine; depression; lactation; conditions exacerbated by fluid retention; hypercalcaemia; CV and gall bladder diseases; lipid effects; familial defects of lipoprotein metabolism; patients at risk of venous thromboembolism, breast cancer, preexisting uterine leiomyomata and benign hepatic adenoma; family history of arterial disease in 1 st degree relative systolic 140 mmHg and diastolic 90 mmHg; >35 yr; BMI 30-39 kg/m2; migraine without focal aura, controlled with 5HT1; Gl upset (vomiting and diarrhoea), missed pills and interaction with other drugs may require additional contraceptive precautions. Should be taken at same time each day.

Lactation: small amounts of steroids are excreted in breast milk; estrogens may reduce quality/quantity of milk; may be prudent to use other forms of birth control until full weaning.

Therapeutic Class

Oral Contraceptive preparations.