available over the counter: yes

uses: treat and prevent recurrence of gastric and duodenal ulcers, as well as conditions which cause increased gastric acid production, and gastroesophageal reflux

mechanism of action: blocks action of histamine, and therefore decreases secretion of hydrochloric acid

side effects
• common: headache, fatigue, drowsiness, nausea, vomiting
• less common: blurred vision, decreased sexual desire or function, swelling of breasts in men and women, temporary hair loss
• serious: irregular heart rhythm, bleeding difficulties, bruising, fever, chills

concerns: avoid cigarette smoking, as it increases gastric acid production