In rare cases, the following, usually reversible, side effects may occur:
From the side of the digestive system: diarrhea or constipation, nausea, vomiting, flatulence, abdominal pain, dry mouth, taste disorders, stomatitis, transient increase in the level of "hepatic enzymes in plasma, in patients with a previous severe liver disease - hepatitis (including jaundice), a violation of liver function.
From the nervous system: headache, dizziness, agitation, drowsiness, insomnia, paresthesia, depression, hallucinations; in patients with severe concomitant somatic diseases, patients with previous severe liver disease - encephalopathy.
From the side of the musculoskeletal system: muscle weakness, myalgia, arthralgia.
On the part of the hematopoiesis system: leukopenia, thrombocytopenia, in some cases - agranulocytosis, pancytopenia.
From the skin: itching; rarely, in some cases - photosensitivity, erythema multiforme, alopecia.
Allergic reactions: urticaria, angioedema, bronchospasm, interstitial nephritis and anaphylactic shock.
Other: visual impairment, peripheral edema, increased sweating, fever, gynecomastia; rarely - the formation of gastric grandeur cysts during long-term treatment (consequence of inhibition of hydrochloric acid secretion, is benign reversible).