I had to switch my BP meds to Methyldopa when we started trying for a baby.
I found apart from being a bit tired for the first few weeks I had no side effects whatsoever.
They have just had to change my medication to Labetalol, as no chemists can get hold of Methyldopa in Cardiff at the moment ( some kind of manufacturing issue apparently ).
The Labetalol aren't really agreeing with me at all. My skin feels like it's crawling and taking a bath is very uncomfortable. Also being plagued by nightmares since starting them. Spoke to my consultant yesterday about changing them, however only Methyldopa and Labetalol are safe in pregnancy so I have to wait until I can get the Methyldopa again .
So I had no problems with them and wish I was still on them
I found methyldopa fine, except like charl said it did make me feel pretty tired/sleepy for the first couple of weeks (though might be hard to discern from first trimester tiredness!)- then my body adjusted and didn't feel any side effects. Also like charl I've been on labetalol and found it had more side-effects, especially the crawly skin thing (mainly on my scalp) and also postural hypotension (stand up too quickly = v low BP and feel like fainting). However with both I didn't start until 3rd trimester when these meds were used to help manage pre-eclampsia. Was on methydopa for a while (4 months) post-partum (as it & labetalol are also compatible with breastfeeding) and felt fine on it.
I took methyldopa when pregnant. Re side effects: didn't notice a thing, Chill out! I suppose it might have made me a bit tired but then I was 36-42 weeks pregnant and so pretty tired generally... Anyway, I felt ok and it did the job.