Fefol Spansule Capsules Fefol is a haematinic. Four-fifths of the dose of iron is specially formulated for sustained release over a period of several hours. Fefol Spansule Capsules are formulated to release most of the iron in the upper small intestine where absorption is greatest, & not in the stomach where gastric irritation may be caused. One Fefol capsule a day throughout pregnancy. Some pregnant patients may need a higher prophylactic dose of iron because of dietary or other factors.