Constipation usually happens if you're not getting enough water. Accutane makes you dehydrated, so try doubling your water intake if you go back on it. Also, magnesium pills at bedtime are excellent for relieving constipation. Most people are deficient so it doesn't hurt to take it.

i posted on another thread too, but in summary the constipation i had from accutane is a lot due to dryness of the anal canal, just like dryness of the lips. putting some vaseline on the anus (sorry about tmi) after shower each day has helped tremendously.

I second magnesium at bedtime--makes you sleep really great as well!