Cimetidine


Article Author:
Maria Pino


Article Editor:
Samy Azer


Editors In Chief:
Sherri Murrell


Managing Editors:
Avais Raja
Orawan Chaigasame
Khalid Alsayouri
Kyle Blair
Radia Jamil
Erin Hughes
Patrick Le
Anoosh Zafar Gondal
Saad Nazir
William Gossman
Hassam Zulfiqar
Navid Mahabadi
Hussain Sajjad
Steve Bhimji
Muhammad Hashmi
John Shell
Matthew Varacallo
Heba Mahdy
Ahmad Malik
Sarosh Vaqar
Mark Pellegrini
James Hughes
Beenish Sohail
Hajira Basit
Phillip Hynes
Sandeep Sekhon


Updated:
7/10/2019 5:23:09 PM

Indications

Cimetidine is a gastric acid reducer used in the short-term treatment of duodenal and gastric ulcers.[1] The drug is effective in managing gastric hypersecretion, and therefore, used for the management of reflux esophagitis disease and in the prevention of stress ulcers. With the development of proton pump inhibitors, such as omeprazole, approved for the same indications, cimetidine is available as an over the counter formulation for the prevention of heartburn or acid indigestion, along with the other H2-receptor antagonists. 

In the past, before the approval of proton pump inhibitors, intravenous cimetidine offered a treatment option to seriously ill patients in the intensive care unit who required prophylaxis against stress-induced ulcers through its H2-receptor antagonist.[2]

Recently, several studies have assessed the use of cimetidine in dermatology, including warts, ulceration, and mastocytosis. For example, treatment of multiple warts in pediatric heart transplant recipients.[3] In adults, cimetidine therapy appears to be beneficial with low toxicity in the treatment of recalcitrant warts.[4] This effect may be due to reports of the immunomodulatory properties of this drug, attributed to cimetidine's ability to reduce regulatory/suppressor T cell-mediated immunosuppression.[5]

There are also reports that cimetidine can inhibit heme biosynthesis and results in symptomatic improvement in children with acute intermittent porphyria, and porphyria cutanea tarda. Both conditions are related to erythropoietic protoporphyria, a rare hereditary disease of heme biosynthesis that manifests with severe photosensitivity and hepatotoxicity. The rapid reduction in photosensitivity was observable within weeks of initiating cimetidine systemic therapy, and skin photosensitivity was also improved. Also, there was a reduction in serum erythrocyte protoporphyrin levels, and liver function tests improved with no adverse effects resulted from cimetidine for over two years of treatment.[6]Similar results were reported with the use of cimetidine and lactulose.[7] However, other researchers reported that there is not enough evidence for the benefit of cimetidine in protoporphyria.[8][9]

Other dermatological indications include (i) condylomata acuminate and papillomatosis in young children,[10] (ii) chronic idiopathic urticaria and other types of urticaria,[11] (iii) pruritus after a burn injury,[12], and (iv) in treating “periodic fever, aphthous stomatitis, pharyngitis, adenitis (PFAPA) syndrome”.[13]

Cimetidine has shown beneficial effects on cell-mediated immunity following burn injury,[14] and alleviated damages induced by long-term low-dose neutron and gamma combined irradiation in animals via antioxidation and immunomodulation.[15]

Other studies support cimetidine as a treatment for bladder pain resulting from interstitial cystitis. There is not yet a conclusion whether the mechanism involves a peptidergic pathway in the human bladder as cimetidine has on the parietal cells of the gastrointestinal tract.[16]

Mechanism of Action

Understanding the physiology of gastric acid secretion is essential for understanding the mechanism of action of cimetidine. The primary stimuli for gastric acid secretion include (i) gastrin, released from antral G cells, (ii) histamine released from oxyntic enterochromaffin-like cells,[17] and (iii) acetylcholine released from antral and oxyntic neurons secondary to parasympathetic (vagal) stimulation. Other stimuli for gastric secretion include ghrelin and motilin. Acid release results from the stimulatory effect of histamine on parietal cells, which is mediated by adenylate cyclase activation and the generation of cyclic AMP (cAMP).[1] This cAMP activates a specific protein kinase, which phosphorylates a yet unknown substrate for the propagation of the stimulatory signal.[18]

 The chief inhibitors of acid secretion are somatostatin released from oxyntic and antral D-cells, cholecystokinin, atrial natriuretic peptides, nitric oxide, and glucagon-like peptide-1.[19]

 The H2-receptor antagonist cimetidine competitively blocks histamine from stimulating the H2-receptors located on the gastric parietal cells (these cells are responsible for hydrochloric acid secretion and secretion of the intrinsic factor). The effect results in reducing the volume of gastric acid secretion from stimuli, including histamine, food, caffeine, and insulin.

Administration

Cimetidine is available as an oral tablet and solution. The drug can also be administered parenterally as an intravenous (IV) injection. The recommended dosage of cimetidine for the pediatric patient is 20 to 40 mg/kg/day administered in divided doses every 6 hours (5 to 10 mg for neonates, and 10 to 20 mg for infants; both divided every 6 to 8 hours also). The recommended dosage for the treatment of peptic ulcers in adults is 300 to 400 mg twice daily or 800 mg at bedtime for up to eight weeks. The maintenance dosage of cimetidine is 400 mg per day. Dosages of 200 to 400 mg (OTC formulations) per day are effective at managing or preventing heartburn caused by the intake of caffeine and certain foods. Thus, cimetidine is administered thirty minutes before a meal.

Adverse Effects

High doses of cimetidine (over 5 g/day) can cause reversible impotence or gynecomastia.[20] This effect appears to be the result of the antiandrogenic potential of cimetidine, which depends on an increase in prolactin levels secondary to histamine H2 receptor blockade. Also, cimetidine has non-specific actions that stimulate prolactin secretion, causing galactorrhea in men in a dose-related pattern.[21][22] The effects could also be related to a blockade of the 2-hydroxylation of estradiol. However, gynecomastia in men is not an adverse effect with the other H2 receptor blockers (ranitidine, famotidine, and nizatidine). 

Patients receiving treatment with drugs metabolized through the cytochrome P450 enzymatic pathway may experience enhanced drug effects resulting from pharmacokinetic interaction when treated concomitantly with cimetidine, as it is a well-known enzyme inhibitor of several CYP isoforms including 1A2, 2C9, 2D6, 3A4 P450 isoforms. Clinically relevant is inhibition of cytochrome 3A4 and 1A2.[20][23]. Inhibition of these enzymes can lead to increased plasma levels of certain drugs including warfarin, tricyclic antidepressants, lidocaine, calcium channel blockers, quinidine, oral sulfonylureas, phenytoin, theophylline, benzodiazepines, and beta-blockers (metoprolol and propranolol). For example, patients treated with warfarin sodium and cimetidine were found to have augmented hypoprothrombinemia and higher blood concentrations of warfarin. Such effects did not occur in patients treated with ranitidine and warfarin sodium. The effect is related to inhibition of hepatic microsomal activity caused by cimetidine, which resulted in reduced metabolic clearance of warfarin and augmented its anticoagulant effect.[24]

The interaction involving beta-blockers (metoprolol or propranolol) results in significant sinus bradycardia and hypotension.[25] Such interaction does not occur with other beta-blockers such as atenolol, or nadolol.

Drug interactions are not observed clinically with other H2-blockers, including ranitidine, famotidine, and nizatidine. Cimetidine raises the pH of the gastric contents. This increased pH may lead to decreased absorption of drugs that require a lower pH to dissolve or increased absorption of drugs with absorption reduced by acid inactivation in the stomach.[26][27]

Impairment of vitamin B12 absorption raises the possibility that long-term, full-dose therapy with cimetidine may produce B12 deficiency similar to that observed in other hypochlorhydric states.[28] This effect is because parietal cells produce intrinsic factor required for vitamin B12 absorption. This effect is more common in younger, female patients and will resolve with the discontinuation of cimetidine therapy.[28]

There is a low incidence of cimetidine-induced hepatitis, suggesting a hypersensitivity-type reaction.[29] There are some reported central nervous system effects, such as headache, dizziness, delirium, drowsiness, and somnolence, which can limit cimetidine's use in the geriatric population and patients with renal and hepatic disorders.[30] Therefore, monitoring of renal function is critical in the elderly to avoid these neuropsychiatric effects. The adverse effects mentioned here, along with the availability of proton pump inhibitors approved for the treatment of similar gastrointestinal conditions, have limited the use of cimetidine.

Contraindications

Cimetidine can induce clinically insignificant elevations of serum creatinine in a high percentage of patients. However, this resolves when the discontinuance of the drug.[31] Recommendations are that patients with a GFR of 10 to 50 ml/minute receive 50% of the normal dose, while patients with a GFR of less than 10 ml/minute receive a dose of 300 mg every 8 to 12 hours. Elderly patients (greater than or equal to 65 years or with a CrCl under 50 mL/minute) should be treated with lower doses to prevent the risk of mental status changes. The use of acid-suppressing drugs during the first trimester of pregnancy is not associated with significant teratogenic risks.[32][33] Therefore, cimetidine is assigned a category B in pregnant females by the FDA, which means that animal studies have failed to show a fetal risk, and there are no adequate and well-controlled studies conducted in pregnant females. Patients who have experienced any hypersensitivity reaction to this drug or any H2-receptor antagonist should avoid cimetidine.

Monitoring

Since there may be an elevation in serum creatinine levels, renal function should be evaluated to either correct or discontinue the dose of cimetidine where appropriate. Blood in the stool is a sign of many gastrointestinal pathologies and drug toxicities. Therefore, the monitoring of occult blood should be considered, especially in patients who may be using this drug without the advice of a physician. Although rare, reports exist of bone marrow suppression. It is advisable to obtain complete blood counts (CBC) if the patient exhibits signs of infection.

Toxicity

Overdoses of cimetidine are rare. However, in the case of toxicity, maintaining the airway and cardiovascular status is critical. Decontamination of cimetidine includes gastric lavage and a reduction of drug absorption by the administration of activated charcoal.

Enhancing Healthcare Team Outcomes

As described by the Beers criteria, the use of cimetidine should be avoided in geriatric patients with delirium or at high risk of delirium as histamine H2 receptor antagonists may induce or worsen mental status.[34]

Healthcare professionals including the pharmacists, primary care provider, and nurse practitioner should counsel patients to stop the drug promptly and report signs of an allergic reaction or worsening of gastrointestinal discomfort, especially blood in the stool, as a more thorough evaluation will be required. Further, it is imperative that physicians, gastroenterologists, pharmacists, and nurses review the current medication history of the patient taking this H2-receptor antagonist, to avoid decreased metabolism of the other drug by cimetidine via the inhibition cytochrome P450 isoenzymes. This interaction potential is especially true since cimetidine is available OTC, and patients may be taking it without first checking with the health care team. Interaction potential is particularly dangerous in patients on warfarin, so the team must be aware of this combination. Nurses often collect medication information from patients, and pharmacists can verify non-prescription drug intake as well. If discovered, the nurse or pharmacist should report to the entire interprofessional healthcare team. This type of collaboration is crucial to ensuring optimal outcomes with minimal adverse events. [Level V]

Patients suspected of having peptic ulcer disease should be investigated- upper gastrointestinal endoscopy and taking gastric mucosal biopsies. Those found to have an H. pylori infection should be treated with a standard triple therapy regimen consisting of a proton pump inhibitor and two antibiotics (clarithromycin and amoxicillin/metronidazole), to eradicate the infection, rather than being treated symptomatically with an H2-receptor antagonist. For obstetricians, patients with reflux esophagitis during pregnancy should have therapy with an H2-receptor antagonist (cimetidine, ranitidine, or famotidine); these drugs are all FDA category B and considered safe during pregnancy. There is no apparent increased risk for spontaneous abortion, preterm labor, or low birth weight after first-trimester exposure to H2-receptor antagonists.[35] However, ranitidine is better studied, making it the preferred H2-receptor antagonist in pregnancy.[33]


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Cimetidine - Questions

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A 37-year-old female presented to her provider with occasional heartburn. She has an extremely stressful job and is not able to eat well. She reports to drinking at least six cups of coffee per day to keep herself going. Aside from changing her lifestyle, her provider recommends cimetidine. Which of the following is the target of this drug?



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An 81-year-old female experienced a stress ulcer after being transferred to the intensive care unit (ICU) after a diagnosis of congestive heart failure (CHF). She was started on cimetidine to manage this condition. Which of the following is inhibited by administration of this drug?



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A 56-year-old female with a history of myocardial infarction managed with metoprolol, atorvastatin, and warfarin experienced episodes of epigastric pain and burning. She was started on a medication to prevent these occasional heartburn symptoms. At her latest physical examination, she complained of bruises and bleeding gums. An elevated PT was noted. Which of the following is the likely cause of her presentation?



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A 47-year-old male experienced episodes of epigastric burning and pain. He was advised to take an over-the-counter-medication to manage these occasional symptoms. Several months later, he presented to his provider with complaints of an enlarged chest and lowered libido. Which of the following is the cause of this effect?



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A 31-year-old female experienced episodes of epigastric burning and pain, associated with consuming spicy foods. She was advised to take over-the-counter cimetidine to manage these occasional gastrointestinal symptoms. Which of the following best describes the mechanism of this drug?



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A patient who just received a renal transplant is seen in the urology clinic. He is presently on cyclosporine to prevent rejection. The patient was recently started on a medication for stomach upset. Upon review, you discover that this drug can inhibit the cytochrome oxidase enzymes in the liver and cause an increase in levels of cyclosporine. Which of the following is the drug in question?



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An 87-year-old female experienced a stress ulcer after being transferred to the intensive care unit (ICU) after having a worsening of her chronic obstructive pulmonary disease (COPD). She was started on cimetidine to manage her gastrointestinal bleeding. The following day, she experienced some hallucinations and delirium. Which of the following should have been performed prior to starting the patient on cimetidine to avoid her recent psychiatric episode?



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A 26-year-old female with a history of peptic ulcer disease was managed with cimetidine for her frequent episodes of heartburn. She recently started on itraconazole after developing a nail fungus from a manicure. The patient was told to take the antifungal two hours apart from her daily cimetidine. Why was this advice given?



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Cimetidine - References

References

Shamburek RD,Schubert ML, Control of gastric acid secretion. Histamine H2-receptor antagonists and H K( )-ATPase inhibitors. Gastroenterology clinics of North America. 1992 Sep;     [PubMed]
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Sabesin SM, Safety issues relating to long-term treatment with histamine H2-receptor antagonists. Alimentary pharmacology     [PubMed]
Martínez C,Albet C,Agúndez JA,Herrero E,Carrillo JA,Márquez M,Benítez J,Ortiz JA, Comparative in vitro and in vivo inhibition of cytochrome P450 CYP1A2, CYP2D6, and CYP3A by H2-receptor antagonists. Clinical pharmacology and therapeutics. 1999 Apr;     [PubMed]
Salom IL,Silvis SE,Doscherholmen A, Effect of cimetidine on the absorption of vitamin B12. Scandinavian journal of gastroenterology. 1982 Jan;     [PubMed]
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Matok I,Gorodischer R,Koren G,Sheiner E,Wiznitzer A,Uziel E,Levy A, The safety of H(2)-blockers use during pregnancy. Journal of clinical pharmacology. 2010 Jan;     [PubMed]
Ruigómez A,García Rodríguez LA,Cattaruzzi C,Troncon MG,Agostinis L,Wallander MA,Johansson S, Use of cimetidine, omeprazole, and ranitidine in pregnant women and pregnancy outcomes. American journal of epidemiology. 1999 Sep 1;     [PubMed]
Das BB,Anton K,Soares N,Riojas S,Mcdermott J,Knox L,Daneman S,Puente BN, Cimetidine: A Safe Treatment Option for Cutaneous Warts in Pediatric Heart Transplant Recipients. Medical sciences (Basel, Switzerland). 2018 Apr 8;     [PubMed]
Jafarzadeh A,Nemati M,Khorramdelazad H,Hassan ZM, Immunomodulatory properties of cimetidine: Its therapeutic potentials for treatment of immune-related diseases. International immunopharmacology. 2019 May;     [PubMed]
Glass AT,Solomon BA, Cimetidine therapy for recalcitrant warts in adults. Archives of dermatology. 1996 Jun;     [PubMed]
Delpre G,Kadish U,Livni E, Hepatitis following cimetidine administration. The American journal of the medical sciences. 1982 May-Jun;     [PubMed]
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Lam JR,Schneider JL,Zhao W,Corley DA, Proton pump inhibitor and histamine 2 receptor antagonist use and vitamin B12 deficiency. JAMA. 2013 Dec 11;     [PubMed]
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Schwinghammer TL, Drug interactions with cimetidine. American journal of hospital pharmacy. 1981 Dec;     [PubMed]
van der Hooft CS,Jong GW,Dieleman JP,Verhamme KM,van der Cammen TJ,Stricker BH,Sturkenboom MC, Inappropriate drug prescribing in older adults: the updated 2002 Beers criteria--a population-based cohort study. British journal of clinical pharmacology. 2005 Aug;     [PubMed]
Hall WM,Ratliff TB, Intensive care experience with intravenous cimetidine. Alabama medicine : journal of the Medical Association of the State of Alabama. 1990 Oct;     [PubMed]
Tu JH,Sheu SL,Teng JM, Novel Treatment Using Cimetidine for Erythropoietic Protoporphyria in Children. JAMA dermatology. 2016 Nov 1     [PubMed]
Fujimori N,Komatsu M,Tanaka N,Iwaya M,Nakano H,Sugiura A,Yamazaki T,Shibata S,Iwaya Y,Muraki T,Ichikawa Y,Kimura T,Joshita S,Umemura T,Matsumoto A,Tanaka E, Cimetidine/lactulose therapy ameliorates erythropoietic protoporphyria-related liver injury. Clinical journal of gastroenterology. 2017 Oct     [PubMed]
Langendonk JG,Wilson JHP, Insufficient Evidence of Cimetidine Benefit in Protoporphyria. JAMA dermatology. 2017 Feb 1     [PubMed]
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