Blood pressure medicine

Mary

So last week my OB doctor started me Labetalol 100 mg every 12 hours. This caused me to have extremely bad headaches. So she switched me to Nifedipine 60 mg once a day. But from what I read it’s also used to slow down unwanted labor. I’m only 13 weeks. Does anyone else take Nifedipine? If so how did it effect you?