Charak Samhita
उद्गारशब्दप्रबलं सफेनं विच्छिन्नकृष्णं तनुकं कषायम्। कृच्छ्रेण चाल्पं महता च वेगेनार्तोऽनिलाच्छर्दयतीह दुःखम्॥९॥
5. Eructation with loud noise; 6. Vomiting of material which is frothy, scattered, black in color, thin and astringent; 7. The urge for vomiting is forceful, but patient vomits only in small quantities with pain; 8. The patient feels miserable
english translation
udgArazabdaprabalaM saphenaM vicchinnakRSNaM tanukaM kaSAyam। kRcchreNa cAlpaM mahatA ca vegenArto'nilAcchardayatIha duHkham॥9॥
hk transliteration by Sanscript