What Is Bismuth Subsalicylate Definition Formula Preparation Reactions and Uses
Bismuth may have been used internally in Europe in the late 1700s, its effectiveness as a treatment for spasmodic discomfort in the stomach and bowels. Soon after, Chambers in the UK and Kussmaul in Germany reported that bismuth salts were a successful medication for dyspepsia. A New York physician created a liquid preparation containing bismuth subsalicylate and zinc salts for astringency, salol (phenyl salicylate) for antiseptic capacity, oil extracts of the wintergreen plant for flavour, and a red dye to create the item pink in an attempt to treat children.
Bismuth subsalicylate is a colloidal compound achieved by hydrolysis of bismuth salicylate with the empirical chemical formula C7H5BiO4. So, this article gives a deep view of knowledge on bismuth subsalicylate and its characteristics.
What is Bismuth Subsalicylate?
An antacid elixir medicine known as bismuth subsalicylate, also known by the trade names Pepto-Bismol and Bis-Bacter, is utilised to treat short-term stomach and gastrointestinal tract aches and pains like nausea, diarrhoea, heartburn, digestive problems, and stomach-ache. Pink bismuth is the generic version of the bismuth subsalicylate medicine.
Bismuth Subsalicylate Medicinal Uses
Bismuth subsalicylate medicine belongs to the class of medications known as antidiarrheal agents. Bismuth subsalicylate medicine, a salicylic acid derivative, does have anti-inflammatory and bactericidal properties. It also functions as an antacid. It operates by lowering the stream of fluids and electrolyte levels into the bowel, reducing inflammation, and possibly killing the organisms that trigger diarrhoea.
Bismuth Subsalicylate Action Mechanism
Bismuth subsalicylate medicine is presumed to be a combination of the ones that follow:
Intestinal wall stimulation of fluid and electrolyte absorption.
As a salicylate, it reduces gastrointestinal and intestinal liner inflammatory processes by inhibiting prostaglandin G/H synthase 1/2.
Reduced stomach harms caused by Escherichia coli.
A quantity of its constituents, such as salicylic acid, has bactericidal activity.
Bactericidal action is achieved through an oligodynamic influence in which tiny constituents of heavy metals like bismuth harm numerous distinct bacteria species.
Warnings
The bismuth subsalicylate warnings are as follows:
If people possess bleeding issues, a gastric ulcer, bleeding in their stools, or if they are sensitive to aspirin or other salicylates, then they shouldn't use bismuth subsalicylate.
If a child or teen suffers from chicken pox, the flu, or a fever, then this medication shouldn’t be given.
Inquire with a physician or pharmacist if using this medication is safe if one possesses mucus in their stools or perhaps a fever right now.
If a person is pregnant or breastfeeding, they should consult a doctor before utilising this medication.
Without first consulting a doctor, never administer this medication to a kid under the age of 12.
Bismuth Subsalicylate Dosages
Patients might not be on a bismuth subsalicylate dosage plan because bismuth subsalicylate is taken as required. If it is nearly up for the subsequent dosage, the patient can ignore the missing bismuth subsalicylate dosages. But never combine two doses at once.
Patients should not consume more than 8 bismuth subsalicylate doses each day.
If a person takes overdosage, then they will need immediate medical help or dial the poison helpline.
Fatigues, despair, anxiety, irritability, issues with balancing or cooperation, disorientation, tremor, or abrupt muscular contractions are a few examples of overdose symptoms.
Bismuth Subsalicylate Side Effects
Some of the bismuth Subsalicylate side effects are as follows:
Hives, wheezing, trouble to breathe, and swelling on the lips, tongue, throat, or face are all indications of an allergic reaction.
Behavioural alterations accompanied by vomiting and nausea.
Impairment of hearing or ringing in the ears.
Diarrhoea that lasts more than two days.
Gastrointestinal condition gets worsened.
Interesting Facts
In regions of the world like North America currently, bismuth subsalicylate is among the most popular stomach medications.
Anticoagulation treatments, such as Coumadin, and bismuth subsalicylate usage are associated with an elevated incidence of bleeding.
After taking a single 30-mL dose of bismuth subsalicylate, which includes 525 mg of bismuth subsalicylate, bismuth is still detectable in gastrointestinal mucosal samples for up to 6 hours, according to studies in dogs.
The cytoprotective effects of bismuth subsalicylate could in fact be attributed to this interaction of bismuth with the gastric mucosal surface.
Key Features to Remember
With the widespread use of bismuth subsalicylate and its financial importance, the pharmaceutical's precise composition was unknown for a long time.
However, using cutting-edge electron crystallographic methods, it was discovered to be a multilayer copolymer with the formula C7H5BiO4.
Bismuth subsalicylate sometimes causes black or blackened tongues. This adverse consequence is unharmful.
Some of the possible side effects include constipation or dark stools.
Medicine should be preserved away from the access of kids and firmly shut in the original container. It should be kept at a normal temperature, free from sources of extreme moisture and heat.
FAQs on Bismuth Subsalicylate Structure Properties and Applications in Chemistry
1. What is bismuth subsalicylate?
Bismuth subsalicylate is an inorganic–organic compound with the approximate formula C7H5BiO4 used mainly as an antacid and antidiarrheal agent. It consists of Bi3+ ions coordinated to salicylate anions derived from salicylic acid. In solid form, it exists as a polymeric complex rather than simple discrete molecules. Chemically, it combines the properties of a heavy metal salt (bismuth) and an aromatic carboxylate (salicylate).
2. What is the chemical formula of bismuth subsalicylate?
The commonly cited chemical formula of bismuth subsalicylate is C7H5BiO4. This represents one salicylate group coordinated to a Bi3+ ion. In practice, the compound forms a complex polymeric structure with bridging oxygen atoms, so the empirical formula reflects its repeating unit rather than a simple molecular species.
3. How is bismuth subsalicylate formed chemically?
Bismuth subsalicylate is formed by reacting a bismuth(III) salt with salicylic acid or a salicylate salt under controlled conditions. A simplified reaction is:
Bi(NO3)3(aq) + 3C7H6O3(aq) → Bi(C7H5O3)3(s) + 3HNO3(aq)
Under partially hydrolyzed conditions, a basic salt (subsalicylate) forms, containing oxide or hydroxide bridges. The exact composition depends on pH and reaction conditions.
4. Is bismuth subsalicylate soluble in water?
Bismuth subsalicylate is practically insoluble in water but reacts in acidic solutions. In neutral water, it remains largely undissolved due to its polymeric and low-solubility nature. However, in the stomach’s acidic environment (presence of HCl), it partially hydrolyzes and releases:
- Bi3+ species
- Salicylic acid (C7H6O3)
This acid reactivity explains its medicinal activity.
5. What type of compound is bismuth subsalicylate?
Bismuth subsalicylate is a coordination compound and a basic salt of bismuth(III) and salicylic acid. It contains:
- A central Bi3+ metal ion
- Organic salicylate ligands
- Bridging oxide or hydroxide groups
Because it contains both inorganic metal ions and organic ligands, it is classified as an organometallic-related coordination complex rather than a simple ionic salt.
6. What happens when bismuth subsalicylate reacts with stomach acid?
Bismuth subsalicylate reacts with hydrochloric acid (HCl) in the stomach to form bismuth oxychloride and salicylic acid. A simplified reaction is:
C7H5BiO4(s) + HCl(aq) → BiOCl(s) + C7H6O3(aq)
The insoluble BiOCl coats the stomach lining, while salicylic acid provides mild anti-inflammatory effects.
7. What is the oxidation state of bismuth in bismuth subsalicylate?
The oxidation state of bismuth in bismuth subsalicylate is +3. Bismuth commonly forms Bi3+ ions in its stable compounds. The salicylate ligand carries a −1 charge, and overall charge balance is maintained within the polymeric structure of the compound.
8. How do you calculate the molar mass of bismuth subsalicylate?
The molar mass of C7H5BiO4 is calculated by summing the atomic masses of all atoms in the formula.
- C: 7 × 12.01 = 84.07 g/mol
- H: 5 × 1.008 = 5.04 g/mol
- Bi: 1 × 208.98 = 208.98 g/mol
- O: 4 × 16.00 = 64.00 g/mol
Total molar mass ≈ 362.09 g/mol. This value is used in stoichiometric calculations involving bismuth subsalicylate.
9. What is the difference between bismuth subsalicylate and salicylic acid?
The key difference is that bismuth subsalicylate is a metal coordination compound, while salicylic acid (C7H6O3) is a simple organic acid.
- Salicylic acid contains a –COOH group and acts as a weak acid.
- Bismuth subsalicylate contains Bi3+ coordinated to salicylate ions.
- Bismuth subsalicylate is poorly soluble in water, while salicylic acid is slightly soluble.
Thus, they differ in structure, composition, and chemical behavior.
10. Why does bismuth subsalicylate sometimes cause black stools?
Bismuth subsalicylate can cause black stools because Bi3+ reacts with sulfur compounds in the gastrointestinal tract to form bismuth sulfide (Bi2S3), a black solid. The reaction can be represented as:
2Bi3+(aq) + 3S2-(aq) → Bi2S3(s)
This black precipitate is harmless and temporary, resulting from normal chemical reactions in the digestive system.
