Serpina is not known to have any side effects if taken as per the prescribed dosage. Available as a tablet. Did you know? Serpina is the world's first natural anti-hypertensive drug. It is also the first drug to be launched by The Himalaya Drug Company in 1934. Serpina is credited with several research papers and clinical trials conducted over the past eighty years. *The information on this page is not intended to be a substitute for professional medical advice. Do not use this information to diagnose or treat your problem without consulting your doctor.