sulphonamide
C2Technical/Scientific
Definition
Meaning
Any of a class of synthetic organic compounds derived from sulfanilamide, containing the chemical group -SO₂NH₂ or its derivatives, historically used as antibacterial drugs.
In a broader pharmaceutical context, refers to antibiotics and other drugs belonging to the sulfonamide class, which work by inhibiting bacterial synthesis of folic acid. Also used in certain non-antibiotic medications like diuretics and anticonvulsants that share the sulfonamide structure.
Linguistics
Semantic Notes
The term is specific to chemistry, pharmacology, and medicine. While 'sulfonamide' (with an 'f') is the standard international spelling in scientific nomenclature, 'sulphonamide' (with 'ph') is a common British English variant. The class is often abbreviated as 'sulfa drugs' in general medical conversation.
Dialectal Variation
British vs American Usage
Differences
Spelling: British English predominantly uses 'sulphonamide'. American English uses 'sulfonamide'. Pronunciation follows the spelling difference.
Connotations
Identical technical meaning. The British spelling can appear in historical medical texts. Both variants are understood globally in professional contexts.
Frequency
In contemporary international journals, 'sulfonamide' is more frequent due to IUPAC conventions. 'Sulphonamide' remains common in UK-published medical and pharmaceutical literature.
Vocabulary
Collocations
Grammar
Valency Patterns
The patient was treated with [sulphonamide].[Sulphonamide] is effective against [Gram-positive bacteria].Resistance to [sulphonamide] has emerged.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Rare. Might appear in pharmaceutical industry reports discussing drug classes or antibiotic market segments.
Academic
Common in pharmacology, medicinal chemistry, microbiology, and history of medicine texts and journals.
Everyday
Very rare. Might be used by a patient with a specific medical history (e.g., 'I'm allergic to sulphonamides').
Technical
The primary register. Used in drug monographs, research papers, clinical guidelines, and medical diagnostics concerning antibiotic choice and drug allergies.
Examples
By Part of Speech
noun
British English
- The doctor decided to try a course of sulphonamide.
- This strain shows reduced sensitivity to several sulphonamides.
- The development of sulphonamides revolutionised pre-war medicine.
American English
- Sulfonamide allergies must be noted in the patient's chart.
- The use of sulfonamides in aquaculture is regulated.
- She is conducting research on novel sulfonamide derivatives.
Examples
By CEFR Level
- Sulphonamides were among the first widely used antibacterial drugs.
- Patients with a sulphonamide allergy should avoid certain antibiotics and diuretics.
- The mechanism of action of sulphonamides involves competitive inhibition of dihydropteroate synthase.
- Cross-reactivity between different sulphonamide-containing drugs is a significant clinical concern.
Learning
Memory Aids
Mnemonic
Think: 'Sulphur' + 'amide' = SULPHONAMIDE. It's a compound containing sulfur (sulph-) in an amide (-onamide) structure.
Conceptual Metaphor
A KEY that BLOCKS a LOCK (the sulphonamide molecule mimics a substrate needed by bacteria, blocking a crucial metabolic pathway).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'сульфаниламид' (sulfanilamide), which is a specific, early type of sulphonamide. The Russian term is often used generically for the class.
Common Mistakes
- Misspelling as 'sulphonemide' or 'sulfanamide'. Confusing it exclusively with antibiotics, ignoring its use in other drug classes (e.g., 'sulphonamide diuretic' like furosemide).
Practice
Quiz
In which field is the term 'sulphonamide' primarily used?
FAQ
Frequently Asked Questions
It is a spelling difference. 'Sulphonamide' is the British English spelling, while 'sulfonamide' is the American English and standard international scientific spelling. They refer to the same class of compounds.
Yes, but their use has declined due to bacterial resistance and the development of other antibiotics with fewer side effects. They are still used for specific infections (e.g., urinary tract infections, nocardiosis), in combination therapies, and in veterinary medicine. Non-antibiotic sulphonamides (e.g., some diuretics) are very common.
A significant risk is allergic reaction, which can range from mild skin rashes to severe Stevens-Johnson syndrome. They can also cause crystalluria (crystal formation in urine) if not taken with sufficient water.
There is a risk of cross-reactivity, so it is generally advised that patients with a known severe allergy to sulphonamide antibiotics avoid all drugs containing the sulphonamide structure, including certain diuretics, unless the benefits are judged to outweigh the risks by a physician.