Pharmacology in Arthritis Flashcards
Disease modifying drugs in arthritis
DMARDS, Biologics
DMARDS used in Arthritis?
Methotrexate
Sulfasalazine
Hydroxychloroquine
Biologics used in arthritis?
Anti-TNF
Rituximab
Tocilizumab
Name a pure analgesic
Paracetemol
anti-pyretic, little anti-inflamm effect
Analgesics
Co-codamol Dihydrocodeine Tramadol Amitryptiline Gabapentin
Properties of NSAIDS
Anti-inflammatory
Analgesic
Antipyretic
Antiplatelet
Adverse effects of NSAIDS?
Ulceration, oesophagitis, gastritis etc Renal impairment Increased cardiovascular events (Cox 2 inhibitors + others) Fluid retention Wheeze Rash
Are DMARDS slow acting?
Yes (weeks - months)
Do DMARDS have any analgesic effect?
No! Purely anti-inflammatory
Improve standard laboratory tests of inflammation e.g.ESR, CRP
Reduce rate of joint damage
What kind of drug might improve standard laboratory tests of inflammation (e.g. ESR and CRP)
DMARDS
How quickly do you want to try and get someone with arthritis onto DMARDS?
Within 3 months of symptoms
Vaccines and DMARDS?
Vaccines should be given before DMARDS are started
-Live vaccines should not be given
DMARDS of choice?
Sulfasalazine, methotrexate
(remember DMARD combination therapy!! both together!!)
Make it intensive!
Methotrexate is an antagonist of what?
Folate
How can methotrexate be given?
Orally or subcutaneously
What is thrombocytopenia?
Deficiency of platelets, this can cause bleeding into tissues, bruising and slow blood clotting after injury
Adverse effects of methotrexate
TERATEGENIC (STOP 3MONTHS BEFORE Myelotoxicity, fibrosing alveolitis Leucopenia / thrombocytopenia Hepatitis / cirrhosis (alcohol intake must be limited) Pneumonitis Rash / mouth ulcers Nausea / diarrhoea Needs monitoring of FBC and LFTs
Why should alcohol intake be limited when on methotrexate?
Methotrexate can cause cirrhosis/hepatitis
Why do you need to monitor LFTS and FBC when you’re on methotrexate?
Methotrexate can cause cirrhosis/hepatitis, leucopania and thrombocytopenia (and others)
What is sulfasalazine?
An azo ester of sulfapyridine and 5-aminosalicylic acid
Which DMARD can cause neutropenia?
Sulfasalazine
Which DMARD can cause reversible oligozoospermia?
Sulfasalazine
Effects of Hydroxycloroquine
No effect on joint damage
Used in connective tissue diseases such as SLE (helps skin, joints and general malaise), Sjogrens and RA
Rare adverse effect of hydroxychloroquine?
Retinopathy
Name a DMARD which can help in SLE and its effects
Hydroxychloroquine (helps skin, joints and general malaise)
Side effects of sulfasalazine?
Oligospermia Myelotoxicty, hepatotoxicity, hypersensitivity reactions Nausea Neutropania Hepatitis Rash/Mouth Ulcers
Anti-TNF that can be given intravenously?
Infliximab
Subcutaneous Anti-TNF therapies?
Etanercept
Adalimumab
Certolizumab
Golimumab
What can anti-TNF therapy be used in?
Rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis
Contra-indications to anti-TNF therapy?
Pulmonary fibrosis, heart failure
Co-codamol?
Analgesic
Dihydrocodeine?
Analgesic
Tramadol?
Analgesic
Amitryptiline?
Analgesic
Gabapentin?
Analgesic
Folate antagonist
Methotrexate
How is methotrexate administered?
Methotrexate can be administers orally or subcutaneously
What is methotrexate used in?
RA, psoriatic arthritis, connective tissue disease and vasculitis
Methotrexate side effects
Myelotoxicity, fibrosing alveolitis TERATOGENIC Leucopenia / thrombocytopenia Hepatitis / cirrhosis (alcohol intake must be limited) Pneumonitis Rash / mouth ulcers Nausea / diarrhoea Needs monitoring of FBC and LFTs
Side effects of sulfasalazine?
Nausea Rash, mouth ulcers Hepatitis Neutropenia Oligozoospermia
Side effect of anti-malarial drugs?
Retinopathy
Side effect of ciclosporin?
Nephrotoxicity, hypertension
Can NSAIDS cause renal impairment?
yesh
NSAID adverse effects
- gastric ulcers
- oesophagitis
- bowel ulceration
- dysphagia
- gastritis
- Renal impairment
- Increased cardiovascular events (Cox 2 inhibitors + others)
- Fluid retention
- Wheeze
- Rash
How do you make anti-TNF therapy more effective?
Give in combination with DMARDS
When is anti-TNF contraindicated?
Pulmonary fibrosis, heart failure
Ustekinumab?
IL12 and IL13 inhibitor
CTLA-4 Ig (blocks full activation of T cells)
Abatecept
What does abatacept do?
Blocks full activation of T cells
CTLA-4
Inhibits interleukin 6?
Tocilizumab
Monoclonal antibody against CD20?
Rituximab
Side effects of colchicine?
Diarrhoea and vomitting
Urate lowering drugs
Allopurinol
Febuxostat
Uricosurics
What do allopurinol and febuxostat do?
Stop the conversion of xanthine to uric acid
allopurinol is a xanthine oxidase inhibitor
Name a xanthine oxidase inhibitor?
Allopurinol
Why do you not prescribe allopurinol initially for acute attacks?
Rapid reductio in uric acid could result in exacerbation of gout. Always co-prescribe anti-inflammatory for the first couple of weeks
Which drug may inhibit warfarin metabolism?
Allopurinol
Which drug could cause marrow aplasia?
Allopurinol
Side effects of allopurinol?
Rash (commoner in elderly)
AZATHIOPRINE INTERACTION
May inhibit warfarin metabolism
Rarely, marrow aplasia
Which drug can allopurinol react with?
Azathioprine
When would you give febuxostat?
For someone who can’t tolerate allopurinol
Which drug can you give if someone can’t tolerate allopurinol?
Febuxostat
When is the rash from allopurinol more common?
In old people and people with renal impairment
Uricosurics
Probenecid
Sulphinpyrazone
Azapropazone
Benzbromarone
Metabolic effects of corticosteroids?
Salt and water retention
Increased gluconeogenesis
Increased hepatic glycogen deposition
Increased protein breakdown
Effects of corticosteroids on the eyes?
Glaucoma, cataratcs
Side effects of leflunomide
Leflunomide (DMARD)
-nausea, diarrhoea and mouth ulcers
Corticosteroids and adrenal suppression?
Corticosteroids can cause adrenal suppression
PTH
Squamous cell carcinoma
ACTH
Small cell
P63
Squamous cell
TTF-1
Small cell and adeoncarcinoma
Cavitates, central necrosis
Keratin
Squmaous cell carcinoma
Biologics for ankylosing spondylitis
IA
Infliximab
Adalimumab
Biologics for SLE
Rituximab
Belimumab
Biologics for psoriatic arthritis
Etanercept
Ustekinab
When is anti-TNF contraindicated?
Pulmonary fibrosis
Heart failure