Hi, Thanks for the query. Usual causes of oligohydromnios are: -Uteroplacental insufficiency -Urological abnormalities in the fetus -Insufficient intake of water by mother -Usage of drugs like angiotensin convertage inhibitors -Sometimes cause cannot be pointed out etc. Arginine sachets and astymin will help in increasing the amniotic fluid. So, you can use them as advised by your doctor. At the same time intake of sufficient water, fluids, nutritious diet, sufficient rest are also important. Prefer left lateral position while sleeping. Regular antenatal checkups and ultrasound examinations are needed to monitor the growth of the baby and to estimate the amniotic fluid levels. Take care.