Possibly related undesirable effects that have been reported in clinical trials or observational studies with Marvelon or CHC users in general are listed in the table as follows:
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A number of undesirable effects have been reported in women using combined oral contraceptives, which are discussed in more detail in Warnings. These include: venous thromboembolic disorders; arterial thromboembolic disorders; hypertension; hormone-dependent tumours (e.g. liver tumours, breast cancer); chloasma.