From the gastrointestinal tract: dry mouth, loss of taste, loss of appetite, epigastric pain, constipation, increased activity of "liver" enzymes, usually without the development of jaundice, hepatonecrosis (dose-dependent effect).
Allergic reactions: skin rash, itching, urticaria, angioedema,
multiforme exudative erythema (including Stevens-Johnson syndrome), toxic epidermal necrolysis (Lyell's syndrome).
From the side of the central nervous system (usually develops when taking high doses): drowsiness, dizziness, psychomotor agitation and impaired orientation.
From the endocrine system: hypoglycemia, up to hypoglycemic
coma.
From the hematopoiesis: anemia, methemoglobinemia (cyanosis, dyspnea, heart pain), hemolytic anemia (especially for patients with deficiency of gluco-6-phosphate dehydrogenase).
From the genitourinary system: pyuria, urinary retention, interstitial nephritis, papillary necrosis.
On the part of the organs of vision: mydriasis, blurred vision, paralysis of accommodation, increased intraocular pressure.
- decreased potency.