Perform this asana early in the morning as it is a good time to take a fresh breath and refresh your body with fresh air. Also in the early morning with an empty stomach, you can perform this asana better. One thing you need to be very careful of is to maintain meal gaps while doing this anulom vilom pranayama.
When you sit to do anulom vilom pranayama think about all your impurities are getting out from your body when you exhale. Then you’ll feel your body and mind are getting fill with positive energy. You’ll feel relaxed.
If you are suffering from any major disease such as anemia and you lack blood cells then avoid doing this yoga. You can continue it but in a slow manner only for 2 minutes is more than enough.
Do not perform this yoga if you are having a problem with high blood pressure. Avoid it if you have any heart disease. In case of surgery, you can’t perform this anulom vilom pranayama as it is risky for your life.
Pregnant women should also avoid doing this Pranayama. They can perform it under a qualified yoga practitioner. There are some conditions for pregnant women to do this yoga they need to be very slow while doing it.
If you are suffering from heart ailments should not attempt to do this. You should refrain from doing retention of breath it will be dangerous for you.