No, the use of a hot water bottle on the abdomen does not affect the effectiveness of Microgynon. The drug is absorbed in the gastrointestinal tract, mainly in the small intestine, and local heating of the skin does not have a significant effect on this process.

Please also note that you should not use boiling water to fill the hot water bottle, as this may damage the hot water bottle.

If, despite everything, this situation raises doubts in you, it is always worth consulting a doctor who can provide more personalized advice. If you are not able to make a face-to-face visit, I attach a link to the online teleconsultation:

https://www.gdziepolek.pl/telekonsultacja/z-ginekologiem

The availability of Microgynon in pharmacies in Polish can be checked at the following address:

https://www.gdziepolek.pl/produkty/48863/microgynon-21-tabletki-powlekane/apteki