The efficacy of the contraceptive pill may be decreased when it is administered concomitantly with other drugs such as anti-epileptic agents, rifampicin, phenylbutazone and ampicillin. With vomiting or diarrhoea, the absorption of oral contraceptives may be diminished and women should be advised to use additional methods of contraception at the time of such disorders. Surgery is more likely to be associated with an increased incidence of thrombotic side-effects. Adequate precaution should be taken. Under no circumstances should the oral contraceptive tablet be stopped without having adopted a satisfactory alternative method of contraception.
Symptomatic treatment is recommended.
Keep out of reach of children.