from http://www.astrojyoti.com/bphspage8.htm
1. By multiplying the years etc. of the Antar Dasha of the Planets separately by the Dasha years of each Planet and by dividing the product by the total span of the Vimshottari Dasha, namely 120 years, we will arrive at the Pratyantar Dasha of each Planet.
20. ….Mars-Mars. Danger from enemies, quarrels and fear of premature death on account of blood diseases.
21. …-Rahu. Destruction of wealth and kingdom (fall of government), unpalatable food and quarrels with the enemy.
22. …-Jupiter. Loss of intelligence, distress, sorrows to children, fear of premature death, negligence, quarrels and no fulfillment of any ambition.
23. …-Saturn. Destruction of the employer, distress, loss of wealth, danger from enemies, anxiety, quarrels and sorrows.
24. …-Mercury. Loss of intelligence, loss of wealth, fevers and loss of grains, garments and friends.
25. …-Ketu. Distress from diseases, lethargy, premature death, danger from the king and weapons.
26. …-Venus. Distress from Chandal, sorrows, danger from the king and from weapons, dysentery and vomiting.
27. …-Sun. Increase in landed property and wealth, satisfaction, visits of friends, happiness all-round.
28. …-Moon. Gains of white garments etc. from the southern direction, success in all ventures.
Jyotish — “Science of Light” (Vedic Astrology) 