Pharmacology Flashcards
List of Aminoglycosides
- gentamicin
- streptomycin
List of macrolide antibiotics
- Azithromycin.
-Clarithromycin. - erythromycin
List of glycopeptide antibiotics
- Vancomycin
- Dalbavancin
- Oritavancin
List of antihistamines
- diphenhydramine
- ranitidine
List of antihypertensives
- Clonidine
List of calcium Channel Blockers
- nifedipine
- Amlodipine
List of antiplatelets
- Aspirin
- clopidogrel
- ticagrelor
- Apixaban.
- Reteplase
- Dabigatran
- Abciximab
- Tirofiban
List of anticoagulants
- heparin
- LMWH
- warfarin
- apixaban
- dabigatran
- rivaroxaban
- fondaparinux
List of Thiazides
- hydrochlorothiazide (HCTZ)
- indapamide
- chlorthalidone
List of DMARDS
- methotrexate
- sulfasalazine
- infliximab
- adalimumab
- leflunomide
- rituximab
- antimalarials
List of antimalarials
- Doxycycline.
- Atovaquone/proguanil.
- Mefloquine.
- Primaquine.
Drugs which undergo entero-hepatic circulation
- Colchicine
- Phenytoin
- Leflunomide (immunosuppressant)
- tetracycline
St John’s wort (Hypericum perforatum) Medication interactions
HIV medicines
warfarin
digoxin
anticonvulsants
oral contraceptives
triptans
Normal range of lithium
0.8 mmol/L to 1.4 mmol/L
Normal: review every 3 months
Therapeutic dosage of corticoid steroids
Continue same dose on IV
List of diseases that require therapeutic steroid dosage
- COPD
- asthma
- rheumatoid arthritis
List of diseases that require physiologic replacement of steroids
- Addison’s disease
Physiologic replacement of steroids dosage
- for patients receiving physiologic replacement doses of glucocorticoids
(Addison’s disease) - additional 50 mg of
hydrocortisone intraoperatively. This dose should be continued for 48 to 72 hours
postoperatively at an interval of 8 hours in patients undergoing major surgery.
Contraindications to use nitrates
-Systolic blood pressure less than 90 mmHg.
– Heart rate less than 50 beats per minute.
– Heart rate greater than 100 beats per minute.
– Known right ventricular infarction.
– Severe aortic stenosis
Mechanism of action of
sulfonylureas
Stimulates pancreatic beta cells and cause secretion of insulin. it does this by increasing responsiveness of
beta cells to both glucose and non-glucose secretagogues (such as amino acids),
resulting in more insulin being released at all blood glucose concentrations.
Thus, sulfonylureas are useful only in patients with some beta cell
function
Examples of Sulfonylureas
- gliclazide
-glimepiride - glipizide
Mechanism of action of Metformin
Enhances insulin binding to the beta cell insulin receptor
treatment-resistant schizophrenia
- give clozapine
if patients are experiencing sedation, decrease dose and review
Increased dosage of dopamine can cause
Extrapyramidal syndrome
Extrapyramidal syndrome
4 types:
1. Parkinsonism
2. Akathisia
3. Acute Dystonia
5. Tardive Dyskinesia
Patient exhibits symptoms of Extrapyramidal syndrome: most appropriate management?
First approach is to consider a reduction in dopaminergic supplementation, without loss of therapeutic efficacy.
If this cannot be achieved, an alternate medication like amantadine, pergolide
Drugs to avoid in patients with Parkinson’s
strong dopamine antagonists
- Haloperidol
Epileptic drugs on OCP
Epileptic drugs induce liver enzymes and reduce the efficacy of oral contraceptive pills by 40%.
- There is 6% failure rate when low-dose oral contraceptive pills are used in women taking anti-epileptic medications (just like St John’s wort)
- In such situation, **oral contraceptive pills with high oestrogen content **(Microgynon 50) should be used to minimise the risk of “pill failure”
List of epileptic drugs
- phenytoin
- carbamazepine/Oxcarbazepine
- barbiturates
- topiramate
- Primidone
– Valproic acid.
– Gabapentin.
– Levetiracetam.
– Pregabalin.
– Vigabatrin
List of chemotherapeutic drugs
- cyclophosphamide
- ifosfamide
- Adriamycin (doxorubicin)
Non-inducing antiepileptic medication
– Valproic acid.
– Gabapentin.
– Levetiracetam.
– Pregabalin.
– Vigabatrin
antibiotics can produce a clinical disturbance similar to
botulism
Gentamicin prevents the release of acetylcholine from nerve endings like botulinum toxin
- can cause muscle paralysis in high-risk patients.
- Symptoms subside rapidly
as the responsible drug is eliminated
Side effects of Gentamicin
- Nephrotoxicity
- Autotoxicity
- Flaccid paralysis
Contraindications of Gentamicin
- pre-existing disturbance of neuromuscular
transmission - Myasthenia gravis
Contraindications of asthma
- beta blockers
Essential tremor treatment in a patient that has asthma
- Primidone (1st choice)
- low dose benzodiazepines
- Stereotactic thalamotomy and deep brain stimulation on treatment-resistant essential tremors
situations when the patient can continue to take hypnotics
Use of medication for up to 6 months or even years:
1. Patient must be aware of this that he/she is dependent on that specific hypnotic.
2. There is no history of any adverse event or adverse side effect from that
medication.
3. Reduction program has been unsuccessful
Digitalis toxicity in ECG
- ST depression and T wave inversion in V5-6 in a reversed tick pattern.
- Bradycardia
- Prolonged PR
- Shortened QT
- Arrhythmias, especially heart block or bigeminy
Signs of raised intracranial pressure
- vomiting
- bradycardia
- hypertension
- drowsiness
Features of hypertensive encephalopathy
- higher blood pressures
more than 180/120 with an insidious onset - headache
- emesis
- confusion
- restlessness and seizures
Amitriptyline/Amiodarone overdose ECG Changes
(TCA toxicity)
Widening of QRS complex
Prolongation of the PR and QT intervals
Ventricular tachycardia and ventricular fibrillation
Amiodarone overdose ECG Changes
Widening of QRS complex
Prolongation of the PR and QT intervals
Ventricular tachycardia and ventricular fibrillation
common cause of false positive elevation of plasma normetanephrine and norepinephrine level in a patient on pheochromocytoma
- Major depression(45%) TCA
- Congestive cardiac failure
– Panic disorder
TCA side effects
- hyperprolactinemia
Raised INR is between 5-9 without bleeding in a patient receiving warfarin
- cease warfarin
- give vitamin K orally or intramuscularly and check INR within 24 hours
Raised INR is between 5-9 with bleeding in a patient receiving warfarin
- Intracranial bleed
- Retroperitoneal bleed
- Intraocular bleed
- Muscle bleed with compartment syndrome
- Pericardial bleed
- Active bleed with hypotension or 2 g fall in haemoglobin
- urgent prothrominex-VF
- fresh frozen plasma immediately
INR reversal
- No active bleeding: Vitmain k only
- Active bleeding: ProthrombAinex-VF + Vit K
Vitmain K contraindications
anti-phospholipid antibody syndrome
Medication that cause alopecia
- lithium (12-19%)
- sodium valproate
- carbamazepine
- phenytoin
How long does vitamin K1 takes to have a therapeutic effect?
IV: 6–8 hours
oral: withing 24 hours
never do IM (haematoma, bleeding)