If the active ingredient is Amprolium in the Medicated feed. The eggs are safe to eat.
Info from Nutrena.
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As for a feed brand, I like and buy both Nutrena Naturewise and Purina.
For an organic feed I like Nature's Best.
All are available at TSC.
When changing feed I like to mix 50/50 for a week.
So when you have 3 to 4 days of the chick feed left, mix it with the layer feed.
If you're switching to a Pellet, try tossing on dry ground with Scratch or Corn to get them interested.
Put out a container of Oyster Shells after 15 weeks old.
Myself I don't feed a layers feed to my hens. I feed a Non-Medicated Starter-Grower 18% or a All-Flock crumble with Oyster Shells separately. GC