BNF: Guidance on Prescribing Flashcards
What does “non-proprietary” mean?
Generic
Should biological medicines be prescribed by brand?
Yes
When are oral syringes provided for liquid medicines?
When the doses are not in multiples of 5mL
Sugar free preparations do not contain what 3 excipients?
Fructose, sucrose, glucose
True or false:
Preparations containing hydrogenated glucose syrup e.g. sorbitol are classed as sugar-free?
True
No evidence that they cause dental caries
The excipient benzyl alcohol is associated with what in neonates?
Fatal toxic syndrome
Polyoxyl castor oils, used as vehicles in intravenous injections, carries the risk of what?
Severe anaphylactoid reactions.
What is the problem with propylene glycol if its elimination is impaired, e.g. in renal failure, in neonates and young children?
Can cause adverse effects. When consumed in toxic quantities, the buildup of lactic acid can lead to acidosis and kidney failure.
What two drugs may interact with propylene glycol? (Hint: alcohol interactants)
Metronidazole and disulfram
For extemp products:
- If the BP direction states that a preparation must be “freshly prepared”, within how many hours must it be made before issued for use?
- If the direction that a preparation should be “recently prepared” indicates that deterioration is likely if the preparation is stored for longer than how many weeks?
- Made within 24 hours of being issued
2. About 4 weeks at 15–25○ C.
Prescriptions for drugs used for contraceptive purposes (but which are not promoted as contraceptives) may need to be marked in handwriting with what symbol?
♀
What does a black triangle next to a drug mean and how long is this retained for?
The black triangle symbol = newly licensed medicines require additional monitoring by the EMA. Products usually retain a black triangle for 5 years, but this can be extended.
All suspected rxns for black triangle drugs should be reported to MHRA
In terms of statistics, what does a very common side effect mean?
Greater than 1 in 10
In terms of statistics, what does a common side effect mean?
1 in 100 to 1 in 10
In terms of statistics, what does an uncommon side effect mean?
1 in 1000 to 1 in 100
In terms of statistics, what does a rare side effect mean?
1 in 10,000 to 1 in 1000
In terms of statistics, what does a very rare side effect mean?
Less than 1 in 10,000
What would be examples of immediate, rapidly-evolving reactions (<1 hour after drug administration)?
- Anaphylaxis, with erythema, urticaria or angioedema, and hypotension and/or bronchospasm.
- Urticaria/angioedema without systemic features
- Exacerbation of asthma e.g. NSAIDs
What would be examples of non-immediate drug reactions without systemic involvement (6-10 days after drug administration)?
Cutaneous reactions e.g. localised inflamed skin
What would be examples of non-immediate drug reactions with systemic involvement (3 days - 6 weeks after drug administration)?
- Cutaneous rxns with systemic features, e.g. drug rxn with eosinophilia and systemic signs (DRESS) or drug hypersensitivity syndrome (DHS), characterised by widespread red macules, papules or erythroderma, fever, lymphadenopathy, liver dysfunction or eosinophilia
- Toxic Epidermal Necrolysis or Stevens–Johnson syndrome
- Acute generalised exanthematous pustulosis (AGEP)
What drugs are capable of causing oral ulceration?
Cytotoxics, ACE inhibitors, gold, nicorandil, NSAIDs, pancreatin, penicillamine, proguanil hydrochloride, and protease inhibitors.
Aspirin tablets allowed to dissolve in the sulcus for the treatment of toothache can lead to what?
White patch then ulceration