Abstract: Preeclampsia and intrauterine growth restriction in a pregnant female mammal are prevented or decreased in severity by administering thereto a combination of a vitamin compound containing B1, Folic Acid (or active form 5-Methyl-Tetrahydrofolate i.e.; Metafolin®), B 6 (Pyridoxine or active form Pyridoxine 5-Phosphate P5P), B 12, Ascorbic Acid, Selenium, Zinc, Co-enzyme Q 10 and N-Acytyl Cysteine, Lycopene, optionally in further combination with Melatonin and/or Vitamin E or/and ASA 81 mg both of later, are cyclooxygenase inhibitors, a PGI.sub.2-mimetic, a thromboxane (TXA.sub.2) inhibitor, a compound possessing TXA.sub.2-agonistic and TXA.sub.2-inhibiting properties, a compound possessing TXA.sub.2-antagonistic and PGI.sub.2-mimetic activities, and a TXA.sub.2 antagonist.