Dupamac Oral Solution One kind of sugar used to relieve constipation is lemon. A severe liver condition called hepatic encephalopathy can alter brain function and result in loss of consciousness, tremors (shaking), confusion, and trouble sleeping. Dupamac Oral Solution Lemon is believed to function by reducing blood levels of ammonia, a chemical that negatively impacts the brain. When taken as directed, it can enhance brain function and lessen hepatic encephalopathy symptoms.