Mercury is the Rasi Lord for Gemini and Virgo Rasi people. For Scorpio and Aquarius natives he is the 8th lord. For Cancer and Libra natives he is the 12th lord.
Transit in the Gandanta degrees will make any planet malefic and natives of all the above mentioned rasis and lagnas have to take precautions to avoid any negative effects of this transit of Mercury.
When Mercury is negative or is transiting in Gadanta degrees it will give the following ill effects :
1.Infections related to Teeth, mouth; 2. Unnecessary anger 3. Accounts will not get reconciled 4. Trouble with maternal uncle 5. Trading lossess 6. Entering wrong contracts 7. Important documents will be lost 8. Mis communications 9. Communication devices like cell phones might be lost or will be damaged 10. Illogical thinking 11. Using foul language
Those facing the above said ill effects during the above mentioned period should Chant or hear to Vishnu Sahasranama stotram everyday or should chant Budha Gayatri Mantra as many times as possible.