Pharmacology of Arthritis Flashcards
Dr S Silburn
name the medications used in arthritis
Analgesics e.g. paracetamol, opiates
Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)
Disease Modifying Anti-Rheumatic Drugs (DMARDs)
Biologics
Gout therapy
Corticosteroids
Special circumstances
what medication is under step 1 in pain control of arthritis?
non-opioid - aspirin, paracetamol or NSAID
what medication is under step 2 in pain control of arthritis?
weak opioid - codeine
what medication is under step 3 in pain control of arthritis?
strong opioid - morphine
give some examples of NSAIDs
Ibuprofen Naproxen Diclofenac Indometacin Etodolac Celecoxib (Cox 2 inhibitor)
what are the indications you should prescribe a NSAID?
inflammatory arthritis
MSK pain
pleuritic/pericardial pain
what are the adverse effects in the use of NSAIDs?
Dyspepsia Oesophagitis Gastritis Peptic Ulcer Small/large bowel ulceration
Renal impairment Increased cardiovascular events (Cox 2 inhibitors + others) Fluid retention Wheeze Rash
what is DMARDs short for?
Disease modifying anti-rheumatic drugs
DMARDs are ____ acting
slow acting - weeks to months
DMARDs are pure anti-inflammatories with no direct analgesic effect
true or false?
true
DMARDs require _______ _________ for adverse effects
regular monitoring
what are the 2 DMARDs of choice in RA?
MTX and sulfasalazine
what are the commonly used DMARDs? (4)
Methotrexate
Sulphasalazine
Leflunomide
Hydroxychloroquine
MTX is a ______ antagonist
folate
what 4 things do you use MTX for?
RA, psoriatic arthritis, connective tissue disease, vasculitis
what are the adverse effects of MTX?
Leucopenia / thrombocytopenia
Hepatitis / cirrhosis
Pneumonitis
Rash / mouth ulcers
Nausea / diarrhoea
what must be limited when taking MTX?
alcohol intake
what needs monitoring with MTX?
FBCs and LFTs
when must MTX be stopped?
Must be stopped in males and females at least 3 months before conception and throughout pregnancy
TERATOGENIC
Leflunomide is similar to MTX but has a very short half life
true or false?
false
leflunomide - very long half life, so requires wash out
when is sulfasalazine used in combination with MTX?
in early inflammatory arthritis
what are the adverse effects of sulfasalazine?
Nausea Rash / mouth ulcers Neutropenia Hepatitis Reversible oligozoospermia
what requires monitoring when taking sulfasalazine?
FBC and LFTs
does Hydroxychloroquine have an effect on joint damage?
no
when is HCQ used?
connective tissue disease such as SLE (helps skin, joints and general malaise) Sjogren’s syndrome and RA
what is the recognised but rare side effect of HCQ?
retinopathy
what is the other name given to sodium aurothiomalate?
gold
ow is the gold given?
IM
what are the adverse effects of gold?
bone marrow suppression, glomerulonephritis, rash , mouth ulcers
what must you monitor when prescribing gold? what are you looking for?
Monitor FBC plus urine for proteinuria.
name some targets for biologics use?
Tumour Necrosis factor (TNF)
CD 20 B cells
Interleukin 6
Interleukin 17, 12 and 23
Anti-TNF therapy is licensed for what 3 conditions?
RA
psoriatic arthritis ankylosing spondylitis
Anti-TNF is more effective in combination with what?
DMARDs
how is Anti-TNF given?
sub-cutaneously
how much do DMARDs cost?
£10000 pa
name some anti-TNF drugs (6)
Etanercept
Adalimumab
Certolizumab
Infliximab
Golimumab
Biosimilars: Benepali
when must you only prescribe anti-TNF?
high disease activity score - DAS28
use of previous standard DMARDs
what are the adverse effects of anti-TNF?
risk of infection - TB
malignancy - skin cancer
when is Anti-TNF contraindicated?
pulmonary fibrosis
heart failure
rituximab is a biologic against…
monoclonal antibody against B (CD20) lymphocytes
Tocilizumab inhibits…
IL-6
Abatacept blocks what?
CTLA-4 Ig -blocks full activation of T lymphocytes
Ustekinumab inhibits…
inhibits IL12 and IL23
Secukinimab inhibits…
IL17
Tofacitinib/baricitinib inhibits…
Janus kinase
name the 2 components to treatment of gout?
acute episode
prophylaxis
what drugs are used in the treatment of an acute episode of gout? (3)
Colchicine
NSAIDs
Steroids, either oral or IM
what is the common side effect of colchicine?
diarrhoea
what drugs are used in the prophylaxis of gout? (3)
Allopurinol
Febuxostat
Uricosurics
what do Allopurinol, Febuxostat and Uricosurics lower?
urate
Allopurinol is a ________ _______ inhibitor
Xanthine oxidase
what are the adverse effects of allopurinol?
rash - vasculitis (commoner in elderly and renal impairment)
marrow aplasia
what other drug does allopurinol interact with?
azathioprine
what is the other drug that is also a xanthine oxidase inhibitor that you use in those who cannot tolerate allopurinol?
febuxostat
you must use febuxostat with caution in those with ________ _____ disease
ischaemic heart disease
name the uricosuric drugs used in gout
Probenecid
Sulphinpyrazone
Azapropazone
Benzbromarone
what conditions indicate the use of corticosteroids? (4)
Connective tissue disease
Polymyalgia rheumatica / giant cell arteritis
Vasculitis
Rheumatoid arthritis
what are the modes of administration in corticosteroids?
Oral Intra-articular Soft tissue injections Intramuscular Intravenous
what are the adverse effects of corticosteroid use?
Weight gain - centripetal obesity Muscle wasting Skin atrophy Osteoporosis Diabetes Hypertension
Cataract Glaucoma Fluid retention Adrenal Suppression Immunosuppression Avascular necrosis of the femoral head
whats the difference between 3 penises and a joke?
your mum can’t take a joke