Yes, you can take a laxative powder or emollients to help relieve constipation caused by prenatal vitamins. It is recommended to take the laxative powder as it is more effective than emollients. Make sure to follow the dosage instructions provided on the product packaging and be patient as it may take 1 to 3 days to start working. Additionally, taking your prenatal vitamins towards the end of a meal may also help reduce constipation. If you continue to experience discomfort despite taking the laxative powder, you may want to consider speaking with a healthcare professional for further advice.