Sulfasalazine: Uses, Dosage & Side Effects
Sulfasalazine is a medication used to treat chronic inflammatory conditions such as rheumatoid arthritis and Crohn's disease. It acts as an anti-inflammatory and immunomodulatory agent.
Things worth knowing about "Sulfasalazine"
Sulfasalazine is a medication used to treat chronic inflammatory conditions such as rheumatoid arthritis and Crohn's disease. It acts as an anti-inflammatory and immunomodulatory agent.
What is Sulfasalazine?
Sulfasalazine is a disease-modifying antirheumatic drug (DMARD) that has been used in medicine since the 1940s. It is a combination of sulfapyridine (a sulfonamide antibiotic) and 5-aminosalicylic acid (5-ASA), linked together by an azo bond. The drug is primarily used in the treatment of inflammatory rheumatic conditions and chronic inflammatory bowel diseases.
Indications
Sulfasalazine is used for the following conditions:
- Rheumatoid arthritis: Long-term treatment to slow disease progression
- Crohn's disease: Treatment of active flares, particularly when the large bowel is affected
- Ulcerative colitis: Treatment and prevention of disease flares
- Ankylosing spondylitis (Bechterew's disease): Reduction of spinal and joint inflammation
- Psoriatic arthritis: Treatment of inflammatory joint changes associated with psoriasis
Mechanism of Action
After oral administration, sulfasalazine is split in the large intestine by gut bacteria into its two active components:
- 5-Aminosalicylic acid (5-ASA / mesalazine): Acts locally in the bowel to reduce inflammation by inhibiting the synthesis of prostaglandins and leukotrienes.
- Sulfapyridine: Is absorbed systemically and exerts immunomodulatory effects, which are particularly relevant in rheumatic diseases.
The precise immunological mechanism is not yet fully understood. It is believed that sulfasalazine inhibits the activation of immune cells, reduces the migration of inflammatory cells into tissue, and decreases the production of pro-inflammatory cytokines such as tumour necrosis factor-alpha (TNF-α) and interleukin-1.
Dosage
The dosage of sulfasalazine is adjusted individually and should always be determined by a physician. Typical dosage regimens include:
- Adults (rheumatoid arthritis): Start with 500 mg per day, gradually increasing to 2,000–3,000 mg per day in 2–3 divided doses
- Adults (ulcerative colitis / Crohn's disease): 2,000–4,000 mg per day in several divided doses
- Children: Dosage based on body weight; medical consultation is mandatory
The medication should be taken with sufficient fluid and preferably with meals to improve gastric tolerability.
Side Effects
Sulfasalazine can cause various side effects, which may occur particularly at the beginning of therapy:
Common Side Effects
- Headache, dizziness
- Nausea, vomiting, stomach discomfort
- Loss of appetite
- Orange-yellow discolouration of urine and skin
- Skin rash
Rare but Serious Side Effects
- Blood count changes: Agranulocytosis, thrombocytopenia, anaemia (regular blood count monitoring is required)
- Liver function disturbances: Elevation of liver enzymes
- Pneumonitis: Lung inflammation
- Oligospermia: Reversible reduction in sperm count in men
- Stevens-Johnson syndrome: Severe skin reaction (rare)
Contraindications
Sulfasalazine must not be taken in cases of:
- Known hypersensitivity to sulfonamides, salicylates, or any of the excipients
- Severe renal or hepatic insufficiency
- Glucose-6-phosphate dehydrogenase deficiency (G6PD deficiency)
- Porphyria
Drug Interactions
The following interactions should be considered when taking sulfasalazine:
- Methotrexate: Increased risk of haematological side effects
- Digoxin and folic acid: Reduced absorption possible due to sulfasalazine
- Anticoagulants (e.g. warfarin): Possible enhancement of anticoagulant effect
- Antibiotics: May affect the breakdown of sulfasalazine in the intestine
Pregnancy and Breastfeeding
Sulfasalazine may be used during pregnancy when the benefits outweigh the risks. However, as it inhibits folic acid absorption, folic acid supplementation (at least 5 mg/day) is recommended during treatment and before a planned pregnancy. Since sulfasalazine passes into breast milk, caution is advised during breastfeeding.
References
- Smolen JS et al. - EULAR recommendations for the management of rheumatoid arthritis with synthetic and biological disease-modifying antirheumatic drugs. Annals of the Rheumatic Diseases, 2020.
- National Institute for Health and Care Excellence (NICE) - Rheumatoid arthritis in adults: management. NICE Guideline NG100, 2023.
- European Medicines Agency (EMA) - Sulfasalazine: Summary of Product Characteristics, 2023.
Building Blocks for a Healthy Life
As an integrated manufacturer, we develop & produce evidence-based, patented, and non-patented formulations. We work exclusively with plant and natural extracts according to the strictest purity & quality standards.
The combination of science & modern technology with the laws of nature creates solutions consistently tailored to humans – for the highest good: health.
Most purchased products
For your iron balance
Specially formulated for your iron balance with plant-based curry leaf iron, Lactoferrin CLN®, and natural Vitamin C from rose hips.
For your universal protection
As one of the most valuable proteins in the body, lactoferrin is a natural component of the immune system.
For Healthy Oral Flora & Dental Care
Formulated lozenges with Dentalac®, lactic acid bacteria, and Lactoferrin CLN®Most read entries
3 Posts in this encyclopedia categoryMagnesiumcarbonat
Calorie content
Cologne list
Related search terms: Sulfasalazine