The most common side effects when taking Zerit (seen in between 1 and 10 patients in 100) are peripheral neuropathy (damage to the nerves in the extremities causing tingling, numbness and pain in the hands and feet), diarrhoea, nausea, abdominal (tummy) pain, dyspepsia (heartburn), fatigue (tiredness), lipodystrophy (redistribution of body fat), dizziness, insomnia (difficulty sleeping), abnormal thinking, somnolence (sleepiness), depression, rash, pruritus (itching) and hyperlactataemia (elevated lactic acid levels in the blood).