BD full form in medical is Bis In Die which refers to “twice a day”. You may have seen doctors and other medical professionals using short terms like BD, DD, or anything like that, especially when prescribing medications to patients. Doctors will specifically mention how many times you should take a particular medicine in a day. And usually, many generic medications are taken twice a day, therefore to simply indicate that or remind the patient, doctors simply put the BD initials or markings on the medication packaging itself as well as on the prescription paper.
It is the medical professional’s responsibility to tell you or educate you about the short terms he/she has used on the prescription paper. That’s because if there are too many medications and the doctor has used the short terms of each of them, then you may get confused. However, BD and DD are the most commonly used ones, so you won’t have any problem with that. Not just that, when you go to a chemist’s shop and hand him/her the prescription paper, he/she will also let you know how many times you should take particular prescribed medicines.