Are H2 receptor antagonists safe over the counter drugs?

This publication has 5 references indexed in Scilit:

• Over-the-Counter Histamine H2-Receptor Antagonists
  Drugs, 1994
• Drugs: from prescription only to pharmacy only.
  BMJ, 1993
• Safety Implications of the Over-the-Counter Availability of H2-Antagonists
  Drug Safety, 1993
• Treatment of Peptic Ulcers Caused by Helicobacter pylori
  New England Journal of Medicine, 1993
• The Risks and Benefits of an Rx-to-OTC Switch
  Medical Care, 1990