Hi, I have been searching the internet and there is absolutely no information on switching from higher doses of estrogen to a lower dose. My doctor is didn't mention anything about how to switch, and is now out of town.
Background: I have been taking a combination birth control pill for about 5 years now. I am absolutely religious about taking it at the exact time each day down to the minute. I am currently not on any supplements/ drugs, besides a multivitimin which I take at the opposite time of day from my pill. I do not use a back-up method of birth control and my partner, who usually withdrawls recently did not (about 4 days into my new pill pack).
I have switched from being on nortrel 1/35 for about a year now (because of side effects), to a triphasic estrostep generic. I am concerned about the innitial effectiveness of the new pill because instead of starting at 35 mcg of estrogen I am starting on 20 mcg (will my body be used to the higher dose and cause me to ovulate)? I started the triphasic pack at the time that I would have started a new pack of my old pills ( on time after inactive week). The package insert doesn't have any information on switching brands.
I could not find any information on the exact brand that you are using. But everything I read about switching from a high dose or combination pill to a lower dose or progestin only pill said this: "If you have been using your birth control consistently and correctly, you should not need an extra birth control method when you transition." Some say that you should begin taking the new pill on the first day of your period but since you have already started on the new pill that is not an option. I think you are safe but I would use a back up method such as spermicide or condoms just to be sure.