Sarpagandha Ghan Vati is an Ayurvedic medicine, used in the treatment of high BP and lack of sleep.
Uses:
It is used in the treatment of lack of adequate sleep, hypertension and dizziness.
Effect on Tridosha: Balances Vata and Pitta.
Dosage: 
(375 mg) – 1 tablet at night, before or after food or as directed by Ayurvedic doctor.
Sarpagandha Ghan Vati Ingredients:
Sarpagandha – Rauvolfia serpentine – 10 g
Khurasani yavani – Trachyspermum ammi – 2 g
Jatamansi – Nardostachys jatamansi – 1 g
Bhanga – Cannabis sativa – 1 g
Water for decoction – 8 parts, boiled and reduced to 1/8 part, filtered.
It is further added with fine powder of 1 g of Pippalimoola – Long pepper root – Piper longum
Tablets are prepared.
Reference: Siddha Yoga Sangraha.