20 categories

Practice

The practical mechanics: arithmetic, preparation, handling, administration, and managing what goes wrong.

194 topics10,175 posts48 solved Moderators: bench_notes, KLindqvist About this category

Dosing & titration 35 Reconstitution 33 Administration 33 Storage & stability 30 Side effects 33 Interactions 30

194 topics

Topic	Participants	Replies	Views	Activity
A 10 mg vial reconstituted three different ways, compared — the long version Practice › Reconstitution reconstitution syringe units worked example concentration maths A 10 mg vial reconstituted three different ways, compared — the long version — setting out what I have, and where I think it stops being reliable. Reporting something rather than asking about it, in case the…	+146	158	47k	9mo
Second pass at: Metformin co-administration and additive GI effects Practice › Interactions hypoglycaemia delayed gastric emptying metformin needs a source On the subject in the title: Second pass at: Metformin co-administration and additive GI effects Working notes rather than a conclusion. I have read the maintained page on this and I still have a gap, so I am…	+131	142	56k	19d
Follow-up: Where the four-week escalation interval comes from, and what it is not Practice › Dosing & titration tirzepatide dose reduction worked example missed dose Wiki Where the four-week escalation interval comes from, and what it is not Writing it up because I had to work it out twice and would rather nobody else did. I have read the maintained page on this and I still…	+131	147	47k	18mo
Coming back to: What published stability data actually covers, and what it does not Practice › Storage & stability cold chain freeze-thaw storage beyond-use date Solved Closed The question in the title: What published stability data actually covers, and what it does not I will give what I have already checked below so nobody repeats it. Practical question with the units stated,…	+136	148	20k	10mo
Warfarin and altered intake: the monitoring argument — the long version Practice › Interactions metformin needs a source delayed gastric emptying hypoglycaemia Solved Posting this under the heading it deserves: Warfarin and altered intake: the monitoring argument — the long version Everything below is what sits behind that. Reporting something rather than asking about it,…	+123	134	40k	4mo
Follow-up: The decimal-point error, and the habit that catches it Practice › Reconstitution concentration maths bacteriostatic water dead volume reconstitution Closed On the subject in the title: The decimal-point error, and the habit that catches it Working notes rather than a conclusion. I have read the maintained page on this and I still have a gap, so I am asking…	+118	131	50k	7mo
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Practice › Reconstitution concentration maths bacteriostatic water syringe units On the subject in the title: A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Working notes rather than a conclusion. Reporting something rather than asking about it, in case the…	+160	165	1.9k	12mo
Delayed gastric emptying and oral medication absorption: which drugs matter Practice › Interactions metformin needs a source hypoglycaemia Solved Wiki On the subject in the title: Delayed gastric emptying and oral medication absorption: which drugs matter Working notes rather than a conclusion. Reporting something rather than asking about it, in case the…	+110	116	43k	14mo
[2026 update] What steady state means for the decision to escalate Practice › Dosing & titration tirzepatide worked example semaglutide missed dose The question in the title: What steady state means for the decision to escalate I will give what I have already checked below so nobody repeats it. I have read the maintained page on this and I still have a…	+127	137	32k	8mo
A reconstituted vial's beyond-use date and the reasoning behind common figures Practice › Storage & stability temperature excursion storage freeze-thaw Posting this under the heading it deserves: A reconstituted vial's beyond-use date and the reasoning behind common figures Everything below is what sits behind that. Practical question with the units stated,…	+125	129	45k	2mo
Reconstituting a multi-strength kit without mixing yourself up Practice › Reconstitution reconstitution concentration maths syringe units Wiki Reconstituting a multi-strength kit without mixing yourself up Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen…	+108	123	30k	11mo
Micro-titration: a disputed topic, argued properly Practice › Dosing & titration titration dose reduction worked example tirzepatide Solved Wiki Micro-titration: a disputed topic, argued properly Writing it up because I had to work it out twice and would rather nobody else did. A question about technique rather than about dose. I have been doing the…	+99	110	61k	2d
[2026 update] Storing lyophilised material long term: what governs the shelf life Practice › Storage & stability beyond-use date freeze-thaw cold chain cloudy or discoloured solution Storing lyophilised material long term: what governs the shelf life — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I have been doing…	+122	133	35k	1mo
Vomiting: when it is expected and when it is a reason to stop Practice › Side effects constipation nausea fatigue Solved Posting this under the heading it deserves: Vomiting: when it is expected and when it is a reason to stop Everything below is what sits behind that. Reporting something rather than asking about it, in case…	+116	124	43k	7mo
Alcohol: what is documented and what is folklore Practice › Interactions metformin insulin delayed gastric emptying Posting this under the heading it deserves: Alcohol: what is documented and what is folklore Everything below is what sits behind that. A question about technique rather than about dose. I have been doing the…	+120	134	11k	2d
A parcel that arrived warm: a decision process, not a verdict Practice › Storage & stability cold chain beyond-use date storage freeze-thaw Solved A parcel that arrived warm: a decision process, not a verdict Writing it up because I had to work it out twice and would rather nobody else did. A question about technique rather than about dose. I have been…	+130	140	12k	8mo
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Practice › Reconstitution syringe units worked example reconstitution bacteriostatic water Solved A 5 mg vial and a 0.25 mg dose: the arithmetic in full Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+124	141	16k	2d
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Practice › Dosing & titration dose reduction semaglutide titration Wiki Posting this under the heading it deserves: Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Everything below is what sits behind that. Reporting something rather than…	+138	148	1.8k	2y
Grapefruit: why this class is not the class that cares Practice › Interactions needs a source hypoglycaemia metformin delayed gastric emptying Grapefruit: why this class is not the class that cares Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+126	139	4k	4mo
Reading an interaction checker output critically Practice › Interactions metformin delayed gastric emptying needs a source On the subject in the title: Reading an interaction checker output critically Working notes rather than a conclusion. I have read the maintained page on this and I still have a gap, so I am asking rather than…	+144	152	3k	4mo
Converting between mg/mL and units per dose, both directions Practice › Reconstitution concentration maths dead volume bacteriostatic water Solved Posting this under the heading it deserves: Converting between mg/mL and units per dose, both directions Everything below is what sits behind that. Practical question with the units stated, because I have…	+106	142	9.5k	19mo
[2026 update] A vial that will not fully dissolve: what to check and in what order Practice › Reconstitution concentration maths dead volume bacteriostatic water syringe units Solved Posting this under the heading it deserves: A vial that will not fully dissolve: what to check and in what order Everything below is what sits behind that. Practical question with the units stated, because I…	+114	128	20k	1mo
Converting between mg/mL and units per dose, both directions — the long version Practice › Reconstitution reconstitution worked example syringe units dead volume Converting between mg/mL and units per dose, both directions — the long version Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated,…	+110	132	1.7k	3mo
Why "dose equivalence" between different incretin analogues is a weak concept Practice › Dosing & titration tirzepatide dose reduction titration semaglutide Solved Why "dose equivalence" between different incretin analogues is a weak concept I have a specific reason for asking rather than idle curiosity, and the context is below. I have read the maintained page on this…	+124	133	11k	5mo
Pinch or no pinch, and how needle length changes the answer Practice › Administration injection site reaction aseptic technique needle gauge & length missed dose Pinch or no pinch, and how needle length changes the answer Writing it up because I had to work it out twice and would rather nobody else did. I have read the maintained page on this and I still have a gap,…	+118	126	11k	9mo
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are fragile Practice › Storage & stability beyond-use date freeze-thaw cloudy or discoloured solution storage Closed On the subject in the title: Second pass at: Adsorptive losses at low concentration, and why dilute solutions are fragile Working notes rather than a conclusion. Practical question with the units stated,…	+77	87	58k	4mo
Stepping down deliberately, and how to do it without losing progress Practice › Dosing & titration worked example semaglutide tirzepatide dose reduction Stepping down deliberately, and how to do it without losing progress — setting out what I have, and where I think it stops being reliable. Practical question with the units stated, because I have seen how…	+98	102	26k	3mo
Anaesthesia and elective surgery: the aspiration question Practice › Interactions metformin insulin delayed gastric emptying hypoglycaemia Posting this under the heading it deserves: Anaesthesia and elective surgery: the aspiration question Everything below is what sits behind that. A question about technique rather than about dose. I have been…	+103	115	6.6k	3mo
Common supplements people ask about, assessed one at a time Practice › Interactions insulin needs a source hypoglycaemia metformin Common supplements people ask about, assessed one at a time — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I have been doing the same…	+101	107	28k	12h
A partial dose because the pen emptied mid-injection Practice › Administration subcutaneous injection needle gauge & length injection site rotation missed dose Solved A partial dose because the pen emptied mid-injection Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+108	120	1.5k	7mo

Sponsored Sigma-Aldrich — certified reference materialsReference standards, analytical reagents and certified materials for method calibration. If you are validating a method, this is where the standard comes from.Reference standards →