-
Systemic photosensitisers
- amiodarone
- griseofulvin
- NSAIDs
- phenothiazines (chlorpromazine, pimozide, clozapine, promethazine, etc. - 'z-drugs')
- methoxsalen (for psoriasis)
- quinolones (ciprofloxacin, moxifloxacin, norfloxacin, ofloxacin)
- retinoids (acitretin, adapalene, isotretinoin, tazarotene, tretinoin)
- SJW
- tetracyclines (doxycycline, minocycline, tetracycline) thiazides (rare)
-
Topical sensitisers
- triclosan
- coal tar derivatives
- fragrances
- methoxsalen
- retinoids (adalaplene, isotretinoin, tazarotene, tretinoin)
- sulfonamides
-
sulphonylureas preferred in elderly
gliclazide and glipizide
-
Thiazolidinediones - ADRs
- wt gain
- anaemia
- oedema
- heart failure
- CV ischaemic events (possibly)
- C/I with insulin - inc risk of HF
- C/I - T1DM, ketoacidosis, Insulin tx, HF (except pioglitazone in class 1)
- Rosiglitazone - increases in HDL and LDL cholesterol
- Pioglitazone - myalgia
-
Insulin - counselling pts
- EtOH - decreases blood glucose, may mask warning signs of hypos, avoid binging, eat something when you drink
- friends and family to know sx and tx of hypos
- inject s/c into abdomen OR thigh/upper arm/buttock
- SA - 30 mins before meals
- ultra-short acting - immediately before meals
- resuspend cloudy insulin (long-acting - humulin, isophane, protaphane) gently rotate vials/cartridges of cloudy insulin
- sulphonylureas - often stopped/reduced once tx est'd, metformin/pioglitazone may be continued - rosiglitazone C/I
-
Sitagliptin - class
- DPP-4 inhibitor
- MOA: inc conc of incretin hormones (e.g. GLP-1) - increases G-dependent I secretion, reduces glucagon production
- Precaution - tx with ACE-i - inc risk of angiodema
- Sfx: hypos, infections, headaches, constipation (infreq)
-
Acarbose
- Swallow whole before meals or chew with first mouthfuls of food
- give glucose but not sucrose (cane sugar) for hypos
- flatulence, diarrhoea, abdominal pain and distension common ADRs
-
Exanitide
- GLP-1 analogue: up insulin, down glucagon (enhances glucose-dependent insulin secretion and suppresses inappropriate glucagon secretion), delays gastric emptying = reduced G absorption rate and decreases appetite
- inject 60 mins before main meals at least 6 hrs apart - BD dosing
- slow stomach emptying - may affect other meds, ensure ABx given at least 1 hr before/4 hrs after exanitide
-
Thyroxine - PPs
- empty stomach, pref before breakfast
- tell if sx of hyperthyroidism occur - palpitations, excitability, insomnia, flushing, sweating, weight loss
-
bisphosphonates - MOA
inhibit osteoclasts (decrease bone resorption)
-
bisphosphonates - ADRs
- common: n, v, d, headache, hypocalcaemia, muscoloskeletal pain
- rare: osteonecrosis of the jaw (risk higher w/ infusion)
- concomitant use of NSAIDs increases irisk of oesophageal adverse effects
-
cholecalciferol vs. calcitriol
- cholecalciferol - slow onset (4-8 weeks), long duration of action (8-16 weeks)
- calcitriol - rapid onset (1-3 days), short duration of action (<1 week), active, higher risk of hypercalcaemia
-
Raloxifene
- SERM
- oestrogen agonist effects on bone
- antagonistic effects on other oestrogen-receptive tissue, e.g. breast and endometrium
- prevention and tx of post-menopausal OP, Primary prevention of BREAST CANCER in high-risk post-menopausal women
- Precautions: VTE hx/risk, CAD
- C/I in pregnancy - cat X
- common ADR: hot flushes (may also aggravate), sweating, leg cramps, p oedema, sleep disorders
- ensure adequate intake of Ca and Vit D
-
corticosteroid replacement therapy in adrenal insufficiency - PPs
- give in 2 doses - 2/3 mane, 1/3 evening
- usual contraindications do not apply
- increase in therapy required during illness and stress --> mild infection = 2-3X dose, serious infection/sx --< IV
-
eye drops - practice points
- write date you open - 28/7
- wash your hands, then sit or lie down
- tilt head back and look up and gently pull down lower lid to create pouch
- 1 dop into pouch - close eyes and gently press against inner corner of eye (over tear duct) for at least 3 mins
- avoid letting top of dropper touch your eyes, skin or other surface
- another drop - allow 5 mins
- clean tissue to mop up excess
- get someone to help/mirror/eye dropper
- try storing in fridge - know when drop in eye
- contact lenses - wait at least 15 mins after before inserting
-
eye ointments
- squeeze small amount (1cm) along pouch then blink several times to spread the ointment
- if using drops, use oinment last
-
eye infections - PPs
- clear away debris and mucus with NS before using medication if possible
- no improvement in 2 days - refer/r/v diagnosis
- contact lenses should not be worn for 24 hrs after infection resolved
-
viral conjunctivitis - tx
- regular use of artificial tears
- cool compresses
- hygeine - avoid sharing facial towels, touching face, etc
- infection until redness and weeping resolves - no antivirals
-
blepharitis
- Seborrhoeic dermatitis of lid margin - greasy, easily removed scales on lid margin
- warm compress (face cloth in warm water - apply for 5-10 mins BD)
- scrub lids BD - 1:10 baby soap:water
-
glaucoma eye drops - lines of tx
- 1: PG analogues
- 2: BBs
- 3: CA-i's
-
drug classes for open angle glaucoma - doses/day
- BBs (e.g. timolol) --> D-BD
- PG analogues (e.g. latanoprost) --> D (nocte)
- Carbonic Anhydrase-i's (dorzolamide) --> BD-TDS
- A2 agonist (e.g. brimonidine) --> BD-TDS
-
BB eye drops - PPs
- use generally C/I in CAL - betaxolol cardioselective and preferred
- consider systemic effects - C/I in bradyarrhythmia, AV block
- oral BBs lower IOP - consider alternate class as may be more effective and lower risk of adverse fx
- avoid tx with verapamil --> profound bradycardia
- ADR: stinging on instillation, bradycardia
- timolol - non-selective, fewer local fx
- betaxolol - selective for B1, stinging
-
PG analogues - PPs
- evening for optimal effect
- structurally different - consider another drug in this class if response to one is poor
- paradoxical increase in pressure if 2 PG analogues used together - avoid combination
-
Carbonic anhydrase inhibitors - PPs
- allergy to sulphonamides - risk of allergy
- common ADR: occular irritation, foreign body sensation bitter taste
- avoid driving if you exp blurred vision
-
treatment for allergic conjunctivitis - mild sx:
- NS BD
- artificial teas - 4-8 times daily
- cold water compresses as required
-
tx for allergic conjunctivitis - moderate sx
- topical drugs:
- ketorolac (acular) - 2-4 wks only - 1 QID
- levocabastine (livostin) - 1 BD
- ketotifen (zaditen) - 1 BD
- olopatadine (patanol) - 1 BD
- azelastine (Eyezep) - 1 BD
- recurrent disease - cromoglycate
-
antihistamine eye drops
- azelasatine (eyezep)
- levocabastine (livostin) - may cause drowsiness
- ketotifen
- olopatadine
- ketotifen (zaditen) and olopatadine (patanol) also have mast-cell stabilising effects
-
Cromoglycate (Opticrom) - PPs
- mast cell stabiliser
- may take 3-6 weeks to reach full effect - i.e. delayed onset of action, 2-4 weeks for noticeable effect
- start tx 1 month before hayfever season or use oral/topical antihistamines until it takes effect
-
secondary causes of dry eyes - drugs
- anticholinergics
- diuretics
- OCP
-
Dry eye drops - drug choice
- preservative containing:
- infrequent use - inexpensive product
- frequent use - product with less irritant preservative, e.g. polytears, genteal
- preservative free:
- non-irritant, but more expensive (bulky single dose)
- useful for use >4-6/day, contact lens wearers, allergy to preservative
- single vials can be used more than once, but discarded in 24 hrs
- ointments/gels: use at bedtime
-
Dose equivalence of PPIs
pantop 40mg = omeprazole/esomeprazole/rabeprazole 20mg = lansoprazole 30mg
-
N+V tx in pregnancy
- most common during first trimester
- ensure ADEQUATE HYDRATION
- ginger (up to 1g D) or pyridoxine (vitamin B6 - 25-50mg TDS PRN)
- if these are ineffective, consider: doxylamine, metoclopramide, promethazine or prochlorperazine
- prochlorperazine suppositories if n+v severe
-
dopamine agonists in n+v - PPs
- domperidone, droperidol, haloperidol, metoclopramide, prochlorperazine
- EPSE (usually acute dystonic reactions*) due to central dopaminergic activity may occur - more common in elderly and <20yrs
- EPSE rare with domperidone - does not X BBB*mainly muscle spasms of face, neck, back and limbs
- domperidone and metoclopramide - widely used, additional prokinetic activity (good for n/v due to gastroparesis)
- prochlorperazine - PREVENT n+v
- droperidol - PONV
-
constipation - dietary and lifestyle changes
- drink water - enough to satisfy thirst and keep urine light-coloured (unless restricted by Dr)
- exercise - develop abdominal muscles
- increase fibre intake - grains, fruits, vegetables; 25-30g D recommended in adults, increase intake gradually to avoid bloating
- use toilet after meals - gastrocolic relfex maximal - 'gut is most active'
- do no resist urge to go
-
laxatives - class and time to effect
- bulking agents: 2-3 days
- osmotic laxatives:
- glycerol, lactulose, sorbitol
- oral 1-3 days, rectal: 5-30 mins; - polyethylene glycol (Glycoprep, movicol)
- oral - 0.5-3 hrs for bowel preparation, 1-4 days for constipation - saline laxatives (epsom salts, microlax, fleet, picolax, picoprep)
- stool softeners: oral - 1-3 days, rectal: 5-20 mins
- stimulant laxatives: oral - 6-12 hrs, rectal - 5-60 mins
-
constipation in pregnancy
- dietary and lifestyle changes preferred
- bulking agents to supplement fibre intake
- docusate, lactulose, sorbitol safe
- occasional doses polyethylene glycol (e.g. movicol) ok if resistant to the above
- stimulant laxatives - avoid
-
diarrhoea in children
- 1: ORS
- antidiarrhoeals not recommended - do not reduce fluid and electrolyte loss, may delay expulsion of organisms, may cause ADRs
-
tx of diverticular disease
- --> diarrhoea
- 1: bulking agents usu useful
- if diarrhoea persists - add opiod antidiarrhoeal, e.g. loperamide
-
Traveller's diarrhoea - tx
- 1: norfloxacin
- 2: azithromycin (suitable in pregnancy and children)
- advise on avoiding/treating infection
- treat symptomatically if mild - ORS - tx for 1-3 days
- seek medical advice if, e.g. bloody diarrhoea, fever
- loperamide may be useful in adults
-
Giardiasis-induced diarrhoea - tx
- 1: tinidazole - as a single 2g (4 X 500mg) dose, give as divided doses in pregnancy
- 2: metronidazole - for 3-7 days, use in children
- adult - 2g once D for 3 days, or 400mg TDS for 7 days if tx fails, children, pregnancy and breastfeeding
- do not tx asymptomatic carriers unless they handle food
- take with food
-
Treatment for Crohn's - drug choice
- depends on goal - remission or induction + other factors:
- 5-aminosalicylates - induce remission in mild-mod disease
- corticosteroids - induce remission (usu 7-14 days), then wean
- Azathioprine + mercaptopurine - induce and MAINTAIN remission, have corticosteroid sparing effect, onset may be up to 3 MONTHS - use adjuvant in interim, no direct comparisons - if not responsive to one, try the other
- MTX - induce remission, prevent relapse - mainly used in pts refractory to/intolerant of AZA and mercaptopurine
- TNF-A antagonists (infliximab, adalidumab) - unresponsive mod-severe disease
- antibacterials (metronidazole/ciprofloxacin) - for perianal fistulae
- other: antidiarrhoeals, cholestyramine (+ im B12) = may reduce diarrhoea
-
Ulcerative colitis - drug choice
- 5-ASAs - induce and MAINTAIN remission in mild-mod disease, combination of rectal and oral synergistic; for distal colitis - choose rectal mesalazine
- corticosteroids - induce remission in severe/refractory acute disease (7-14/7)
- azatioprine + mercaptopurine - limited ev in UC, used for maintaining remission and corticosteroid-sparing effects, onset may be 3/12
- cyclosporin: iv, rapid onset (usu 1 week) for severe, unresponse disease, once in remission, use other agents for maintenance
- Infliximab - induce and MAINTAIN remission in unresponsive, mod-sev disease
- antidiarrhoeals (eg. loperamide, codeine) - CONTRAINDICATED (risk of toxic megacolon)
- Antispasmodics - not recommended
-
lifestyle advice for BPH
- look for aggravating factors - constipation, diuretics, anticholinergics, sedating drugs
- reduce caffeine and EtOH intake
- bladder training
- reduce fluid intake at night
-
BPH - drug choice
- selective A-blockers - 48 hrs to effect
- 5-A- reductase inhibitors - reduce prostate size, may take 6 months before sx improve (12-18 months for full effect)
- both inc urinary flow rate
- combination - when prostate large and rapid relief required, selective alpha blocker can be stopped at 6-12 months in mst pts
-
antibiotic to avoid in prostatitis
nitrofurantoin - penetrates prostatic tissue poorly
-
OA - lines of therapy
- 1: lifestyle (regular exercise + other - wt loss, physical activity, devices - walking stick)
- 1: regular paracetamol
- 2: topical NSAID, capsaicin, rubefacient + reg paracetamol
- 3: PRN NSAID (e.g. 30-60 mins b4 painful activity), intra-articular steroids, hyalans
- 4: higher NSAID dose
- 5: opiods, orthopaedic r/v
- NB: many pts on LT NSAIDs can be switched to paracetamol w/out inc in sx
-
NSAIDs - MOA
- analgesic, antipyretic, anti-inflammatory
- inhibit PG synthesis via COX-inhibition
- - COX-1 inhibition = impaired gastric cytoprotection and antiplatelet effects
- - COX-2 inhibition = anti-inflammatory and analgesic activity
- - reduction in GFR and renal blood flow occurs through both COX-1 and COX-2 inhibition
- little-no effect on COX-1 inhibitors at therapeutic doses of COX-2-i's
-
NSAIDs - PPs
- no rationale for >1
- maximal effect in 2 weeks. no response = switch after 3 weeks
- monitor FBC, Cr, LFTs
- lowest effective dose for shortest possible time
-
RA - PPs
- ensure all pts receieve pneumococcal and annual influenza vaccinations
- withdrawal in apparent remission --> relapse
-
RA - lines of tx
- disease suppression: antirheumatic agent + analgesic, corticosteroid (low dose pred) or NSAID
- mild-disease activity: sulfasalazine or hydroxychloroquine (sulfasalazine acts sooner and more effective)
- mod-severe disease: low-dose MTX (1st line), other immunosuppresants; leflunomide or cytokine modulators (biological agents, e.g. rituximab) when antirheumatics/immunosuppresants (inc MTX) inappropriate/ineffective
- combination often needed to slow progression of jt damage (e.g. rituximab + MTX)
-
malaria prevention
- use insect repellants
- wear protective clothing
- take medications regularly/at right time
- See Dr if fever develops w/in 12 months of possible exposure
-
Gout - tx during anticoagulation
- 1: systemic corticosteroids
- 2: colchicine
- avoid NSAIDS - risk of bleeding
-
acute soft tissue injuries - tx
- bursitis/tendonitis:
- rest injury - by avoiding painful activities, not immobilisation
- passive motion exercises
- local heat/ice packs
- analgesics - reduce pain, aid mobilisation - paracetamaol and NSAIDs have similar efficacy
- also consider topical NSAIDs and rubefacients
- strains + sprains:
- RICE for first 2 days
- early mobilisation and recovery - use analgesics
- topical NSAIDs or rubefacients
-
Paracetamol + back pain
no evidence for its efficacy in this condition
-
rubefacients and other topical musculoskeletal agents
- apply BD - QID PRN for up to 14 days, r/v use after this
- rub product in completely as may stain clothing and temporarily discolour skin
- photosensitivity
-
seizure precipitants
- lack of sleep
- stress
- alcohol withdrawal
- ilicit drugs
- changes in medication/non-compliance
-
antiepileptics which induce CYP3A4s
CBZ, PHY, oxCBZ, barbiturates, topiramate
reduce efficacy of oral contraceptives - consider medroxyprogetserone depot or copper IUD if possible, or high-dose COC if not.
-
CBZ - PPs
- TDM - th range = 4--12mg/L
- take with food
- drowsiness and blurred vision at start of tx
- increase fx of EtOH
- CYP3A4 inducer
- refer if: rash, sore throat, fever, mouth ulcers, bruising, bleeding
- do not stop taking suddenly
- increase dose slowly - autoinduction
- monitor for skin reactions - SJS, toxic epidermal necrolysis
- BMD monitoring - vit D + cal if needed
-
Anticholinergics
- atropine
- belladona alkaloids (atropine, hyoscine)
- benzhexol
- benztropine
- darifenacin
- glycopyrrolate
- hyoscine
- iptratropium
- oxybutynin
- solifenacin
- tiotropium
- tropicamide
-
Migraine - lines of tx
- 1: simple analgesic - paracetamol (less effective), aspirin, NSAID
- 2: if ineffective (e.g. for 3 attacks/severe): triptan, ergot alkaloid at onset of attack
- antiemetic for n+v (metoclopramide/domperidone)
- avoid opiods - may aggravate sx, dependence, little evidence
-
Triptans - PPs
- 5HT1 agonists
- relief w/in 30-60 mins (longer with naratriptan)
- aid associated sx (n, v, photophobia, phonophobia)
- 1/3 may have recurrence of headache - give 2nd dose
- most effective when taken when headached BEGINNING TO DEVELOP, not earlier (during aura) or later (when headache severe)
- sumatripatn most studied
-
ergot alkaloids - PPs
- limited by ADRs - peripheral vasoconstriction
- taken at onset of attack
- do NOT take with triptan
- lack of ev re dose
- rectal/sc/im
-
Drugs in migraine prevention
- 1: BBs (propranolol, metoprolol, atenolol), amitriptyline
- 2: valproate, topiramate
- 3: methysergide, pizotifen - but limited by ADRs
treatment of acute attacks still needed - may take 1-3 months for full effect
-
Secondary prevention of stroke
- antiplatelet - asprin, clopidogrel, dipyridamole with aspirin (headache + BD dosing affect compliance, but more effect than aspirin alone)
- warfarin in AF
- antihypertensives
- statins
- carotid sx (high risk pts)
-
SSRIs - PPs
- - most ppl can be maintained w/ 10mg escitalopram, 20mg citalopram, paroxetine, fluoxetine, 50mg sertraline, 50-100mg fluvoxamine
- - doses may be higher in the tx of OCD and eating disorders (vs. if for depression or anxiety)
- - withdraw gradually - 50% weekly
- - fluoxetine has an active metabolite and long half life = long wash over
- - lower seizure threshold
- - increase bleeding risk - consider PPI
- indications: depression, OCD. PTSD, PMS
-
TCAs - ADRs
- sedation
- anticholinergic
- orthostatic hypotension
-
Precautions of antipsychotics
- PD - risk of aggravation
- epilepsy - lowers seizure threshold
- respiratory failure - resp dep
- hyperthyroidism - risk of acute dystonia
- QT prolongation
- shock - hypotension
- glaucoma, urinary retention - anticholinergic fx (esp chlorpromazine, clozapine, olanzapine)
- elderly - higher risk of orthostatic hypotension, confusion, anticholinergic fx, acute EPSE
- ADRs traditionally reported with older agents, less common/severe with newer ones
-
common sfx of antipsychotics
- sedation, EPSE*, orthostatic hypotension, blurred vision, constipation, anticholinergic fx, wt gain, hyperprolactinaemia (--> womanising fx)
- metabolic fx: inc BSL, wt gain, dyslipidaemia, inc risk of T2DM
- EPSE - dystonia (spasms) - have benztropine on hand, akathisia (feeling of motor restlessness), parkinsonism (tremor, rigidity, bradycardia - tardive), tardive dyskinesea (involuntary movements after M-LT tx)
-
comparison of sfx of conventional antipsychotics - sedation, anticholinergic, EPSE, othostatic hypotension, metabolic
low potency - more sedating, low EPSE, more othostatic and anticholinergic fx
- low potency = chlorpromazine
- high potency = haloperidol
atypical APs generally have lower incidence of EPSE
-
Bipolar - mood stabilisers - monitor
electrolytes, LFTs, blood picture
-
ADHD - drug choice
- 1: psychostimulants - dexamphetamine, methylphenidate (give more than once d, except low doses or CR methylphenidate)
- 2: atamoxetine (risk of suicidal thoughts/beh)
- 3: TCAs, clinidine (A-adrenergic, sedative properties)
- SSRIs not indicated
-
adverse effects of nicotine
- alters HR
- constricts coronary blood vessels - IHD + thromboembolism
- benefis of stopping smoking: red MI risk and premature death
-
advice on quitting smoking
- behavioural techniques to aid and encourage cessation (e.g. avoiding triggers)
- refer to quitline (13 QUIT)
- nutritional advice (e.g. fruit for snacks)
- exercise program - help avoid wt gain
- NB: withdrawal effect = hunger
-
Smoking cessation - drug choice
- bupropion (Zyban) - X2 quit rate; inhibits NA and dopamine uptake - prec with schizo and dep; insomnia (40%) and seizures
- NRT - X2 quit rate
- varenicline (Champix) - >2X quit rate; partial agonist at nicotine Rs, reduces withdrawal and pleasurable effects of smoking; nausea (30%) - may req dose red, apparent withdrawal and return to smoking on tx cessation
-
Precautions with theophyllines
- GORD - inc gastric acid
- arrhythmia - exacerbation
- HF, pulmonary oedema - red clearance = red dose
- thyroid dysfn - hyperT = inc CL, hypoT = dec CL - adjust dose
- smoking - inc CL
- epilepsy - dec seizure threshold
- B2 ag = inc risk hypoK
- TOXICITY: common - GORD, insomnia, palpitations; rare - seizures
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