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2nd placement drugs
2nd placement drugs
30
Pharmacology
Undergraduate 4
10/30/2014

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Term
Amitriplyline (endep) C ( congential malformations).
Definition
Mode of Action: TCA inhibit reuptake of noradrenaline and serotonin into presynaptic terminals
Indication: Major Depression, Insomnia or Neuropathic pain, urinary urge.
Dose: Major Depression: start 25-75mg, can increase by 25-50 every 3 days (300mg max), pain: 10-25mg daily (150mg max)
Adverse Reactions: Anticholingeric like dry mouth, urinary retention, dry eyes, constipation, weight gain, palpitations, orthostatic hypo
Refer: increase S/E, no effect, skin reactions, palpitations.
Lifestyle: Counselling.
Interactions: SSRI, SNRI, Tramadol (serotonin syndrome).
Counselling: Don’t drive until you know the effects, limit alcohol, don’t stop taking abruptly. Avoid in prolonged QT intervals.
Term
Amoxycillin/Clav acid (augmentin duo) B1.
Definition
Mode of Action: Amoxycillin (attacks the bacteria cell wall peptidoglycan and causing cell lysis, Clav acid extends the spectrum by inhibiting beta lactamase).
Indication: Hospital acquired pneumonia, UTI, Otitis media, Acute bacterial sinusitis, PID.
Dose: 500-875mg bd plus 125mg of CA for 5-10 days, >1 month 7.5-15mg/kg Q8h max 20mg/kg, >2 months 22.5mg/kg bd. (can be up to 50mg/kg for severe infections).
Adverse Reactions: Diarrhoea, nausea, allergic reactions.
Refer: If signs of allergic reaction, or improvement in infection.
Lifestyle: Probiotics.
Interactions: none.
Counselling: Take for the recommended time, and better with food.
Term
Buprenorphine (Norspan Patch, Temgesic tabs or inj) C.
Definition
Mode of Action: Opioid analgesics mimic endogenous opioids by activating opioid receptors in the central and peripheral nervous systems to produce analgesia. Is also a partial agonist, so may block other opioids effects and increase withdrawal for addicts.
Indication: Moderate to Severe pain relief.
Dose: Acute: IM/IV, 300–600 micrograms every 6–8 hours. Sublingual, 200–400 micrograms every 6–8 hours.
Chronic: 5 microgram/hour patch in opioid-naive people, Do not increase dose at intervals of <3 days; do not apply >2 patches concurrently; maximum dose 2 x 20 microgram/hour patches. Each patch must be changed every 7 days.
Adverse Reactions: nausea and vomiting (below), dyspepsia, drowsiness, dizziness, headache, orthostatic hypotension, itch, dry mouth, miosis, urinary retention, constipation, respiratory depression.
Refer: Pain not adequately controlled.
Interactions: other opioids.
Counselling: about sublingual tablets, and patches (7 days).
Term
Carbamazapine (tegretol) D.
Definition
Mode of Action: Prevents repetitive neuronal discharges by blocking voltage-dependent and use-dependent sodium channels.
Indication: Neuropathic pain, Antiepileptic, Bipolar.
Dose: Epilespy : initially 100 mg twice daily; increase daily dose gradually by 100–200 mg every 2–4 weeks according to response. Usual range, 400 mg – 1.2 g daily in 2 or more doses; up to 2 g daily may be required. Child: 5-8mg/kg, increase to 10-20mg/kg.
Trigeminal neuralgia: Adult, initially 50–100 mg once or twice daily; increase gradually to 400–800 mg daily in 2–4 doses. Up to 1.6 g daily may be required.
Bipolar: Adult, initially 400 mg daily in divided doses; increase gradually according to response, up to 1.6 g daily.
Neurological pain: Adult, initially 100 mg twice daily; increase gradually until pain relieved. Maintenance, 200–600 mg daily, do not exceed 1.2 g daily.
Adverse Reactions: drowsiness, ataxia, dizziness, blurred vision, diplopia, headache (all dose-related), rash, dry mouth, abdominal pain, nausea, vomiting, anorexia, diarrhoea, constipation.
Refer: SJS, no effect, increased side effects.
Interactions: Clarithromycin, Diltiazem, Fluoxetine, macrolides, Valproate and Verapamil increase carba, Phenytoin decrease it. Decreases warfarin and levonorgestrels effects.
Counselling: Take with food, may cause drowsiness, limit alcohol and do not stop taking abruptly.
Term
Ceftriaxone (injection only) A.
Definition
Mode of Action: Interfere with bacterial cell wall peptidoglycan synthesis by binding to penicillin-binding proteins, eventually leading to cell lysis and death; bactericidal.
Indication: Empirical treatment for Infections like pneumonia, bacterial meningitis, orbital cellulitis, PID and septicaemia.
Dose: 1-2g daily (max 4g), Child: 50-75mg/kg daily (max 2g).
Adverse Reactions: NVD, CDAD, pancreatitis, dizziness, pain at site, allergic reaction.
Refer: allergic, CDAD, no improvement.
Lifestyle: Probiotics.
Counselling: Monitor renal function and FBC.
Term
Diazepam (Valium, Antenex) C (avoid if possible).
Definition
Mode of Action: Potentiate the inhibitory effects of GABA throughout the CNS, resulting in anxiolytic, sedative, hypnotic, muscle relaxant and antiepileptic effects.
Indication: Anxiolytic, Sleep, Epilepsy.
Dose: Seizures: IV and rectal 10mg repeat in 10-15 mins if needed. Child: 0.2 to 0.3mg/kg (max 10mg).
Spasms: IV 10mg repeat in 4 hours if needed, oral: 2-15mg (max 60mg). Child IV and oral: 0.1-0.3mg/kg.
Adverse Reactions: Drowsiness, sedation.
Refer: no improvement.
Lifestyle: Sleep hygiene, plenty of water
Interactions: phenytoin.
Counselling: Avoid alcohol, may cause drowsiness, if long term do not stop taking abruptly.
Term
Dicloxacillin/Flucoxacillin (Diclo: Distaph, Flucox: Staphex) B2, B1.
Definition
Mode of Action: Interfere with bacterial cell wall peptidoglycan synthesis by binding to penicillin-binding proteins, eventually leading to cell lysis and death; bactericidal.
Indication: Severe skin infection (staph) like folliculitis, boils, stab wounds , impetigo, septicaemia
Dose: Dicloxacillin: PO: 250-500mg q6h, Max 4g, child 12.5-25mg/kg q6h (max 1g). Flucloxacillin: orally the same, IV: 1-2g every q6h (max 12g), child IV 25mg/kg (max 1g).
Adverse Reactions: NVD, pain at site, superinfections, allergy, electrolyte disturbances, increased liver enzymes.
Refer: allergy, no improvement.
Lifestyle: Probiotics. Monitor: hepatic functions, renal functions and blood count for prolonged treatment.
Interactions: increases warfarin’s effect.
Counselling: best on an empty stomach (30 minutes before or 2 hours after).
Term
Etanercept (Enbrel) B2.
Definition
Mode of Action: Bind to TNF alpha and inhibit its activity, which is a cytokine involved in the inflammatory/immune response.
Indication: Psoriasis, RA, anklosing spondylitis.
Dose: SC: 50mg weekly or 25mg twice weekly (3-4 days apart). Child: 0.8mg/kg (max 50mg).
Adverse Reactions: injection site reaction, allergic reaction abdominal pain, dyspepsia, headache.
Refer: allergic reaction, or no improvement.
Monitor: FBC, LFTs, creatinine before treatment, check for infections like TB, Hep B, skin cancers, and adverse effects.
Counselling: contact doctor if bruising, breeding or fever occurs. See doctor before getting vaccinations while on this medication before of immunosuppression.
Term
Gentamicin (injection or eye drops Genoptic) D.
Definition
Mode of Action: Aminoglycoside that Inhibits protein synthesis by irreversibly binding to the 30S ribosomal subunit and causing cell membrane damage. Concentration-dependent bactericidal effect.
Indication: Severe infections. Empirical treatment of gram negative infections, P aeruginosa, surgical prophylaxis. Enterococcal infections.
Dose: use ideal weight to calculate dose, CrCl: >60ml/min, IM/IV 5-7mg/kg daily, CrCl 30-60: 4-5mg/kg, <30: seek specialist advice. Prophylaxis: 2-5mg/kg. Child: 7.5mg/kg (max 320mg), >10 years 6-7mg/kg.
Adverse Reactions: Nephrotoxicity, Ototoxicity, Neuromuscular blockade, anaphylaxis.
Refer: adverse effects, no improvement.
Monitor: >48 hours monitor concentrations and calculate CrCl every 3-5 days. Infusion over 15-30 minutes with <120mg IV over 3-5 minutes. Hearing and kidneys.
Term
Haloperidol (Serenace) C.
Definition
Mode of Action: by blockade of dopaminergic transmission in various parts of the brain, block d2 receptors
Indication: Antipsychotic, anxiety, terminal agitation, intractable nausea and vomiting.
Dose: N&V: 1-2mg tds oral, agitation: oral 1-5mg tds or IM/IV: 2-10mg every 2-6 hours (max 15g). Child>5: 0.25mg daily, increase to 0.15mg/kg daily (max 5g).
Adverse Reactions: Sedation, EPSE (dystonias, Akathisia, Parkinsonism, Tardive dyskinesia), orthostatic hypotension, blurred vision, anxiety, dry mouth, urinary retention. Rare is neurolepic malignant syndrome.
Refer: increased side effects, no improvement.
Lifestyle: limit alcohol, montior effect, weight, blood glucose, BP, lipids at baseline, routine FBP and LFTs
Interactions: Carbamazepine decreases it, Fluoxetine, Fluvoxamine, venlafaxine increase it.
Counselling: Take regularly, consider if injection is better, understand what the EPSE are, may cause drowsiness and dizziness.
Term
Hormonal Contraception (Too Many) (levlen ED 150mcg levonorgestrel/ 30mcg ethinyloestradiol) B3.
Definition
Mode of Action: All COCs contain an oestrogen and progestogen. They inhibit ovulation, reduce receptivity of endometrium to implantation and thicken cervical mucus to form a barrier to sperm.
Indication: Contraception control, Endometriosis, menstrual disorders, acne.
Precautions: Increase stroke risk: smoking, >35, >30, breast cancer, frequent migraine with aura, antiphospholipid syndrome.
Adverse Reactions: Breakthru bleeding (change to higher dose ethinyloestradiol 50mcg or change progesterone), amenorrhoea, NV, breast tenderness, changed libido, acne, thrush, fluid retention. VTE risk for desogestrel and cyproterone.
Refer: increase side effects.
Lifestyle: tell your doctor or pharmacist if you are on any other medications.
Interactions: carbamazepine, phenytoin, SJW reduce its affect, COC decrease lamotrigine effect.
Counselling: seek medical advice if increased side effects, know active pills and sugar pills, what to do if missed pill, vomiting or diarrhoea (within 2 hours), take another active pill asap. Less than 24 hours late take active asap, if more the pill will not be effective, take 2 the next time, and use alternative contraception for 7 days of continuous tablets. If the pill missed was in the 1st after the sugar pills, seek emergency contraception if had sex during or after that time.
Term
Lamotrigine (Lamitcal) D.
Definition
Mode of Action: Stabilises presynaptic neuronal membranes by blocking voltage-dependent and use-dependent sodium channels.
Indication: Partial and generalised seizures, Bipolar.
Dose: 25mg daily for 2 weeks, then 50mg for 2 weeks, then increase by 50-100mg every 1-2 weeks according to response, Maintenance: 100-200mg daily. Reduce if on valproate by half (every second day). Child: 0.3mg/kg daily, then the same ratio as adults. Double if on inducers like carbamazepine or phenytoin.
Adverse Reactions: blurred vision, ataxia, dizziness, alopecia, NV, SJS, and multi-organ hypersensitivity.
Refer: allergic reaction, no improvement.
Interactions: COC, Carbamazepine and phenytoin decreased it, Valproate increases it.
Counselling: may cause dizziness, increases alcohols effect, do not stop abruptly. Monitor LFTs.
Term
Levodopa/Carbidopa (Madopar) B3.
Definition
Mode of Action: Levodopa is converted to dopamine in the brain and peripheral tissues, and replenishes depleted striatal dopamine. It is given with a peripheral dopa decarboxylase inhibitor (benserazide or carbidopa) to reduce peripheral dopamine production and also reduce adverse effects (eg nausea, vomiting, hypotension).
Indication: Parkinson.
Dose: Initially: 50-100mg 2 to 3 times, adjust gradually if needed, can give up to 2g in 3 divided doses, or 6 doses. CR formulation is available too (release over 4-6 hours).
Adverse Reactions: Anorexia, NV, orthostatic hypotension, agitation, insomnia, depression, confusion, dyskinesia, discolouration of urine and sweat.
Refer: no improvement or increased adverse effect.
Interactions: Methyldopa increases levodopa effect, phenytoin decreases it. Dopamine antagonist are bad for people with parkinsons.
Counselling: Take at the same time each day, be careful standing up, do not stop taking abruptly, may cause drowsiness. Protein in food reduces absorption (better on empty stomach)
Term
Lithium (Lithicarb, Quilonum) D.
Definition
Mode of Action: its actions include inhibition of dopamine release, enhancement of serotonin release and decreased formation of intracellular second messengers.
Indication: Manic bipolar, schizophrenia.
Dose: Acute: 750-1000mg in divided doses, increase by 250-500mg depending on concentration (max 2500mg). prophylaxis: 250-1000mg daily.
Adverse Reactions: metallic taste, nausea, diarrhoea, epigastric discomfort, weight gain, tremor, T wave changes, hypothyroidism, polyuria, nephrotoxicity. Toxicity: blurred vision, NVD, ataxia. Severe: increased muscle tone, hyper-reflexia, seizures, comas.
Refer: toxicity signs, increased side effects.
Monitor: TR (0.5-1.2).
Interactions: Ural increases it, ACEi, NSAIDs, sartans, thiazides increase it, carbamazepine and lithium can result in neurotoxicity.
Counselling: take with food, maintain normal diet.
Term
Metoclopramide (Maxolon, Pramin) A.
Definition
Mode of Action: Dopamine Antagonist
Indication: Anti-emetic (nausea and vomiting), gastric stasis (like gastric surgery) .
Dose: 10mg tds >60kg (max 0.5mg/kg daily), 30-59mg half the dose, 20-29: half again, 15-19kg: 2mg tds, 10-14: 1mg tds, <10kg: 0.1mg/kg bd (max 1mg). Chemo: 10-20mg then every 4-6 hours if required.
Adverse Reactions: akathisia, depression, EPSE.
Refer: increase EPSE, no improvement.
Interactions: Dopamine agonist in parkinsons (apomorhine, bromocriptine, pramipexole, rotigotine).
Counselling: may cause dizziness and drowsiness.
Term
Metronidazole (Flagyl) B2.
Definition
Mode of Action: Metronidazole and tinidazole are metabolised to active metabolites that are thought to interfere with DNA synthesis.
Indication: gram positive and negative anaerobic bacterial infections, protozoal infections (giardiasis) bacterial vaginosis, PID, dental infections
Dose: 200-400mg 8-12 hours (max 4g), severe IV: 500mg 8-12 hours. Child: 7.5mg/kg every 8 hours or 10mg/kg every 12 hours (max 400mg). IV (max 500mg). give with amoxicillin tds for H pylori 14 days, bacterial vaginosis 400 bd for 7 days, trichomoniasis give 2g as a single dose.
Adverse Reactions: Thrombophlebitis (IV), pancreatitis, hepatitis, NVD, metallic taste.
Refer: no effect or increased side effects.
Lifestyle: no alcohol while on this medication.
Interactions: Alcohol, disulfram (increase alcohol effect), increases warfarin and fluorouracil.
Counselling: avoid alcohol, with food, may cause dizziness initially.
Term
Oxycodone (Endone, Oxycontin, Oxynorm, Targin with naloxone) C.
Definition
Mode of Action: Opioid analgesics mimic endogenous opioids by activating opioid receptors in the central and peripheral nervous systems to produce analgesia.
Indication: Moderate to severe pain relief.
Dose: initially: 2.5-5mg every 4 hours, titrate dose until stable, then can calculate CR dose (breakthrough is one 6th of the daily dose). 15-20mg oral is equivalent to 10mg of IM/SC morphine. Child: 0.1-0.2mg/kg (max 5mg).
Adverse Reactions: NV, sedation, constipation, dizziness, orthostatic hypotension, dry mouth, respiratory depression.
Refer: no improvement, constipation, increased sedation, trouble breathing.
Lifestyle:
Interactions: Clarthromycin increases it, SJW decreases it.
Counselling: stick to recommended dose.
Term
Olanzapine (Zyprexa) C.
Definition
Mode of Action: Antipsychotic actions are thought to be mediated (at least in part) by blockade of dopaminergic transmission in various parts of the brain.
Indication: Antipsychotic for schizophrenia, bipolar.
Dose: 10mg daily, increase by 2.5-5mg to 20mg daily. IM 210-300mg every 2 weeks.
Adverse Reactions: Hyperglycaemia, peripheral oedema, increased weight, EPSE (rare)
Refer: increased androgenic effects, no effect.
Lifestyle: Stop smoking (reduces olanzapine effect), monitor signs of schizophrenia or bipolar, BSL, weight, lipids.
Interactions: Carbamazepine, valproate decrease it, fluvoxamine increases it.
Counselling: Do not stop taking abruptly, limit alcohol and cannabis (illicit drugs), may cause drowsiness or dizziness.
Term
Omeprazole (Acimax, Losec) B3.
Definition
Mode of Action: Irreversibly inactivate the hydrogen/potassium ATPase enzyme system (proton pump), suppressing both stimulated and basal acid secretion.
Indication: GORD, peptic ulcers.
Dose: 20mg daily (IV 40mg), Child: <10kg: 5mg daily, >10kg: 10mg daily.
Adverse Reactions: B12 anaemia, alopecia.
Refer: no improvement.
Lifestyle: decrease alcohol, caffeine, spicy foods.
Interactions: reduces clopidogrel effect, fluconazole increases it, SJW decreases it.
Counselling: do not crush, can have disperse.
Term
Ondansetron (Zofran) B1.
Definition
Mode of Action: Central and peripheral 5HT3 receptor blockade.
Indication: Anti-emetic (nausea and vomiting), for chemo, radiotherapy and post op related.
Dose: Severe and moderate cancer chemo treatment: IV: 8-12mg, oral 16-24mg. Child: 0.15mg/kg every 4 hours or 4mg orally. Radio: 8mg bd, post op: 4mg.
Adverse Reactions: constipation, headache, high LFTs, hypersensitivity (rare).
Refer: no improvement.
Interactions: Apomorphine (severe hypotension). Increases tramadols effect.
Term
Pipercillin/Tazobactam (Tazocin) B1.
Definition
Mode of Action: Same as Amoxycillin, Tazobactam: Beta Lactams inhibitor,
Indication: Severe Infections, P aeruginosa, mixed infections (anaerobes and aerobes), febrile neutropenia.
Dose: 2-4g every 6-8 hours (max 24g), decrease slight for renal impairment. Child: 1-6 months: 80-100mg/kg every 8 hours, >6 months give 100mg/kg every 8 hours (max 4g).
Adverse Reactions: jaundice, high LFTs, rash, NVD, superinfection (candiasis), allergy.
Refer: CDAD, allergy, jaundice, no improvement.
Lifestyle: probiotics.
Interactions: Increases warfarins effect.
Counselling: Monitor: FBP, hepatic function when >10 days treatment.
Term
Pregabalin (Lyrica) B3.
Definition
Mode of Action: An analogue of the neurotransmitter GABA with analgesic, anxiolytic and anticonvulsant activity; reduces calcium influx at nerve terminals and decreases the release of several neurotransmitters including glutamate, noradrenaline and substance P.
Indication: Neuropathic pain, partial seizures.
Dose: 75mg bd initially, increase if needed after 3-7 days to 150mg bd, max 300mg bd. Reduce if renally impaired (30-60: 75mg daily, 15-30: 25-50 daily, <15: 25mg daily.
Adverse Reactions: dizziness, drowsiness, weight gain, visual disturbance, ataxia, constipation, peripheral oedema, dry mouth.
Refer: peripheral oedema, no improvement.
Counselling: limit alcohol, do not stop taking abruptly, may cause drowsiness.
Term
Risperidone (Risperdal) C.
Definition
Mode of Action: Antipsychotic actions are thought to be mediated (at least in part) by blockade of dopaminergic transmission in various parts of the brain.
Indication: Antipsychotic for schizophrenia, bipolar, dementia behavioural problems.
Dose: 1mg bd, (usual is 4-6mg), long acting IM: 25mg every 2 weeks (max 37.5-50mg). Dementia: 0.25mg bd (usual range 0.5-1mg), Child: >50kg 0.5mg daily (range 0.5-1.5mg), <50kg: 0.25mg daily (range 0.25-0.75mg).
Adverse Reactions: insomnia, akathasia, headache, rhinitis, EPSE, sexual adverse effects, SIADH.
Refer: increased EPSE, no improvement.
Interactions: Carbamazepine and Paroxetine decrease it, Fluoxetine increases it.
Counselling: treatment response in about 1-2 weeks, do not stop taking abruptly.
Term
Sertraline (Zoloft) C.
Definition
Mode of Action: Blocks the reuptake of Serotonin, therefore stopping the breakdown of serotonin.
Indication: Major Depression, panic disorder, PDMS.
Dose: 50mg starting, (max 200mg), child: 25mg.
Adverse Reactions: Agitation, dizziness, tremor, impotence, sweating, weight gain, high LFTs, hyponatraemia.
Refer: no improvement.
Lifestyle: seek counselling if needed.
Interactions: MAO-B, MAOIs, pethidine, tramadol, TCA, SNRIs, Triptans (serotonin toxicity), increases warfarins effect.
Counselling: do not stop talking abruptly, may cause dizziness. This SSRI of choice for breast feeding.
Term
Sumatriptan (Imigran) B3.
Definition
Mode of Action: Constrict cranial vessels by acting selectively at 5HT1B/1D receptors; also thought to inhibit the abnormal activation of trigeminal nociceptors.
Indication: Acute relief from Migraines.
Dose: 50-100mg, repeat in 2 hours if reoccurs (max 300mg).
Adverse Reactions: tingling, heat, pain, tightness, flushing, dizziness, myalgia.
Refer: no relief, tightness around chest, angina, rash.
Lifestyle: drink plenty of water, dark room when occurs, ID possible cause.
Interactions: MAOIs, moclobemide (increase ischaemia risk), SSRIs (serotonin toxicity).
Term
Thyroxine (Eutroxig) A.
Definition
Mode of Action: T4 endogenous thyroid hormone,
Indication: hypothyroidism, thyroid cancer.
Dose: 1.6mcg/kg, 50-200mcg daily, adjust dose every 6-8 weeks if needed. Child and elderly adjust by 25mcg, 25mcg
Adverse Reactions: palpitations, flushing, sweating, weight loss, insomnia.
Refer: increased palpitations, flushing, sweating, weight loss, insomnia (signs of hyperthyroidism).
Lifestyle: maintain a healthy diet.
Interactions: increases warfarins effect, calcium carbonate, iron, orlistat decrease its absorption.
Counselling: take on empty stomach. Keep in the fridge. Monitor TSH and free T4.
Term
Tramadol (Tramal, Zydol) C.
Definition
Mode of Action: Opioid analgesics mimic endogenous opioids by activating opioid receptors in the central and peripheral nervous systems to produce analgesia.
Indication: Moderate to severe Pain Relief.
Dose: max 400mg daily, avoid in CrCl <10 and no Slow release for under <30.
Adverse Reactions: weakness, sweating, confusion, drowsiness, sleep disorder, SJS, respiratory depression, dry mouth, urinary retention.
Refer: no improvement, signs of serotonin toxicity.
Interactions: SSRI, SNRI, MAOIs (serotonin toxicity).
Counselling: may cause drowsiness, be careful standing, limit alcohol, long term dental check ups (dry mouth).
Term
Valproate (Epilim) D.
Definition
Mode of Action: Prevents repetitive neuronal discharge by blocking voltage-dependent and use-dependent sodium channels.
Indication: Primary generalised epilepsy, Bipolar.
Dose: Epilepsy: Initially: 600mg or child 10mg/kg in 2 doses, increase 3 days by 200mg or child 5-10mg/kg according to response. Maintenance: 1-2g or child 20-40mg/kg daily in 2 doses (max 2.5g). Bipolar dose is the same. Migraine: oral 200-400mg bd.
Adverse Reactions: nausea, dizziness, vomiting, increased appetite, weight gain, tremor, ataxia, drowsiness, elevated aminotransferase.
Refer: increased side effects or no effect.
Interactions: Aspirin increases valproate, Lamotrigine, olanzipine and phenytoin decrease it.
Counselling: Take with food, see doctor if jaundice occurs, may increase drowsiness and weight, limit alcohol.
Monitor: bloods, BMD, Liver function.
Term
Vancomycin (Vancocin) B2.
Definition
Mode of Action: Bactericidal; inhibit bacterial cell wall synthesis by preventing formation of peptidoglycan polymers.
Indication: Severe infections, MRSA, CDAD, surgical prophylaxis, penicillin resistant infections.
Dose: IV: 1-1.5g bd, consider loading dose (25-30mg/kg), followed by 15-20mg/kg every 8-12 hours. Child: > 1month, IV 15mg/kg (max 750mg) q6h or 15-20mg/kg tds (max 1g). CDAD: oral: 125mg q6h for 10 days, child 5mg/kg.
Adverse Reactions: Nausea, allergic reactions, Nephrotoxicity, Ototoxicity, red man syndrome.
Refer: Allergic reactions, red man syndrome, nephro or oto toxicity.
Counselling: Monitor: renal function, hearing if on for long periods, concentration trough levels (10-20mg/L).
Term
Venlafaxine (Efexor) B3.
Definition
Mode of Action: Inhibit serotonin and noradrenaline reuptake.
Indication: Major depression, general anxiety.
Dose: 75-150mg daily (225mg).
Adverse Reactions: Nausea, dry mouth, constipation, orthostatic hypotension, hypertension, impotence, decreased appetite, hyponatraemia.
Refer: high BP, no effect, increase in seizures.
Lifestyle: seek counselling for help also, get enough sleep.
Interactions: Mao-B, MOAIs, SSRI, TCA (serotonin toxicity).
Counselling: Take with food, do not stop taking abruptly, be careful when you first start taking it. Monitor effect, BP and sodium.
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