Nishmat's Women’s Health and HalachaIn memory of Chaya Mirel bat R' Avraham

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Veset on new pill

1 March, 2005


My doctor switched me from regular Orthotricyclen to Orthotricyclen Lo. Previously I had established a veset haguf of three days after stopping the active pill. Do I now have to establish a new chazaka since the amount of hormone in the pill has changed? If so, what do I do in the meantime?

Thank you for providing this valuable service.


The first month you go on the new pill, keep the entire range from day 2 to day 4 after stopping the active pill as your onot perishah – no relations, but you are not in niddah status. If you see that your period once again begins on day 3 after stopping, continue your previous veset haguf. If not, keep 2-4 days until you establish a new veset haguf.

Be aware that with lower dosages there is more chance of breakthrough bleeding, so make sure you wear colored underwear and avoid looking at toilet paper in order not to get into problems with staining.

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