Moderate or severe symptoms occur in 20-30% of these patients.

Sometimes the snake may not inject any venom, in which case no symptoms will arise.(2)

Viper bites often result in severe local pain, progressive swelling and a bluish discoloration. In severe cases early symptoms might also include dizziness, nausea, vomiting, diarrhoea, abdominal pain, breathing difficulties, hypotension, cardiac disturbances and reduced level of consciousness. (2)

• Keep the person calm and at rest with the bitten body part still.
• Call the Poison Centre, Emergency center or a physician for advice.
• Everyone with an adder bite should obtain medical attention at an emergency room.
• Anyone who becomes lethargic, has vomited or has trouble breathing should seek medical attention immediately.