It is not necessary to take folic acid supplements after taking Elavil, because it contains 0.8 mg of folic acid, which is sufficient for the prevention of fetal neurovertebral malformations. However, it cannot be taken until the full term of pregnancy because the exact dose of folic acid taken during pregnancy depends on the results of the folic acid bioavailability test, and then the appropriate dose of folic acid supplementation is given. If the risk of folic acid bioavailability is low, you can take 0.4 mg of folic acid supplementation in early pregnancy and stop after 12 weeks of pregnancy. For moderate risk, 0.8mg of folic acid can be taken in early pregnancy and reduced to 0.4mg taken after 13 weeks of pregnancy until the full term of pregnancy. In case of severe risk, you can take 0.8mg of folic acid in early pregnancy and still take 0.4mg of folic acid to be taken after 13 weeks of second trimester until the whole pregnancy. However, the folic acid content of Elavil is 0.8mg. If folic acid is taken in excess or in shortage, it can cause adverse effects, so you cannot always take only Elavil unchanged, but you should decide the dose of folic acid to be taken according to the results of folic acid bioavailability test.