Insulins Roland Halil, BScPharm, ACPR, PharmD

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Presentation transcript:

Insulins Roland Halil, BScPharm, ACPR, PharmD Clinical Pharmacist, Bruyere Academic Family Health Team Assistant Professor, Dept of Family Medicine, U of Ottawa July 2016

Insulins Table **Animal-source insulin- demand has decreased now that human insulin is available. There are some patients who cannot control their diabetes on human insulin. **Beef insulin also available through Health Canada’s Special Access Programme. Humalog 388 For the treatment of patients with Type 1 diabetes mellitus.   LU Authorization Period: Indefinite. 389 For the treatment of patients with Type 2 diabetes mellitus using insulin in an intensive regimen with 3 or more injections per day or an insulin pump.   LU Authorization Period: Indefinite. 390 For the treatment of patients with Type 2 diabetes mellitus who are either experiencing recurrent hypoglycemia OR are unable to achieve adequate post-prandial glucose control while on a less intensive regimen of regular insulin (1-2 injections per day). NovoRapid Humulin R, NPH vial $15, 3X5 cartridges 32$ Humalog, Novorapid vial 23$, 3X5 cartidges $46 New Drugs/Drug News vol 24 (3): May/June 2006

Insulins - Background Long = Basal Short = Prandial Premixed NPH, (N) Glargine (Lantus) Detemir (Levemir) Short = Prandial Short Regular (R) Toronto Rapid Lispro (Humalog) Aspart (NovoRapid) Glulisine (Apidra) Premixed 30/70 (and 10/90, 20/80, 40/60, 50/50) Humalog Mix-25, NovoMix-30 Which to choose?

Basic Concepts Hyperglycemia = Chronic Hypoglycemia = Acute So, go after Hypo’s first! Fed: 6h/24h = 25% Fasting: 18h/24h = 75% So, go after Fastings first! AM affects PM & HS So, go after AM first! ?Any hypo’s?- fix ‘em! then, FBS AM FBS Noon FBS PM FBS HS 2h PPG AM 2h PPG Noon 2h PPG PM

Humalog Mix-25, NovoMix-30 (Rapid + NPH) Insulins - Long-Basal Long – Basal NPH, (N) Glargine (Lantus) Detemir (Levemir) Short – Prandial Short Regular (R) Toronto Rapid Lispro (Humalog) Aspart (NovoRapid) Glulisine (Apidra) Premixed 30/70 (and 10/90, 20/80, 40/60, 50/50) (R + NPH) Humalog Mix-25, NovoMix-30 (Rapid + NPH) Now, which to choose?

Rational Prescribing FOUR steps to Rational Prescribing: Benefit Harm Cost Convenience

Long – Basal Insulins Benefit: NPH = Lantus = Levemir = NPH Equivalent Morbidity benefits, A1c lowering effect Despite the marketing: Kinetics don’t affect overall efficacy: Slowest absorption: Thigh (best for basal insulins) Fastest absorption: Abdomen (best for prandial insulins) Lots of Lantus is injected BID NPH can be used QHS for some

Long – Basal Insulins cont’d Harm: All: Hypoglycemia NPH: Peak effect at ~ 8hrs (4-10hrs) Risk of hypoglycemia (~ 5%? vs “peakless” insulins) Lantus / Levemir: Insulin analogues Increased breast cancer risk? more research needed

Long – Basal Insulins cont’d 2 Cost: All: covered under ODB N.B. No Rx required for any insulins – all OTC NPH: ~ $40 Lantus: ~ $90 Levemir: ~ $100 Convenience: All sc injections, via penfills All QD – BID

Bottom Line – Basal Insulins All equivalent Choose therapy based on cost (NPH) For the very small proportion suffering from hypoglycemia due to the peak effect of NPH or lamenting BID dosing, consider Lantus or Levemir.

Starting Basal Insulin Fancy Way: calculate unit/kg dose = 0.1 - 0.2u/kg/day sc Risk hypoglycemia on first dose – lose your patient’s buy-in forever. Primary Care Method: Initiate 5u or 10u qhs sc Titrate by 1-2u q3-4d until AM FBS = 4 - 7 mmol/L 10% titrations If dose = 30’s – increase by 3 units If dose = 40’s – increase by 4 units etc. etc.

Rx NPH Needle tips – 28G - 6mm N.B. (Please teach pt pen technique) Sig: 5u qhs sc or ud M: 1 box penfills Repeat x 12 Needle tips – 28G - 6mm Sig: ud M: 1 box r x 12 N.B. (Please teach pt pen technique)

Insulins – Short - Prandial Long = Basal NPH, (N) Glargine (Lantus) Detemir (Levemir) Short = Prandial Short Regular (R) Toronto Rapid Lispro (Humalog) Aspart (NovoRapid) Glulisine (Apidra) Premixed 30/70 (and 10/90, 20/80, 40/60, 50/50) (R + NPH) Humalog Mix-25, NovoMix-30 (Rapid + NPH)

Short – Prandial Insulins Efficacy Equivalent reduction in morbidity, HgbA1c

Short – Prandial Insulins cont’d Toxicity Hypoglycemia Rapid insulins better reflect physiological effect of pancreatic insulin (vs Regular insulin) More important in CKD (=longer insulin t½ )

Short – Prandial Insulins cont’d 2 Cost All covered under ODB Regular (R) / Toronto ~ $40 NovoRapid (aspart) ~ $56 Humalog (lispro) ~ $55 Apidra (glulisine) ~ $48 Convenience All injected with meals Regular insulin injected 30-45 min before meal Rapid insulin can be taken with meal Reduced risk of hypo if pt injects, then forgets to eat

Bottom Line – Prandial Insulins All equivalent Choose therapy based on cost / familiarity Rapid insulins reflect pancreatic insulin release better than [R]/Toronto. The worse the CrCL, the more important this fact becomes.

Starting Prandial Insulin Fancy Way: Total dose: 0.5u/kg 40% of total dose - basal insulin qHS 20% of total dose TID with meals (60%) – prandial insulin 15-30 min before meals Eg. 80kg pt – 0.5u/kg = 16u basal (40%); 8u TID (20% x 3 = 60%) Primary Care Method: Start 5u sc with meals Titrate AM to HS to target Monitor 2h PPG Start injection TID or only single meal as required If poor control: inj TID sc; If mediocre control: inj qAM sc Still aim for ~ 2/3rds split (40% basal / 60% prandial)

Humalog Mix-25, NovoMix-30 (Rapid + NPH) Insulins – Pre-mixed Long = Basal NPH, (N) Glargine (Lantus) Detemir (Levemir) Short = Prandial Short Regular (R) Toronto Rapid Lispro (Humalog) Aspart (NovoRapid) Glulisine (Apidra) Premixed 30/70 (and 10/90, 20/80, 40/60, 50/50) (Reg + NPH) Humalog Mix-25, NovoMix-30 (Rapid + NPH)

Pre-mixed Insulins NovoMix-30 = Humalog Mix25 (equivalent) Efficacy All ~ 30% short / 70% long Toxicity Hypoglycemia (less with Rapid vs Regular insulin) Cost: ~$53 (Rapids) ~$40 (Regular 30/70) Convenience ~ Rapids can be injected with meal

Starting Pre-mixed Insulins Fancy Way: Estimate total starting daily dose (0.3-0.6 units/kg) Divide daily dose: 2/3 before breakfast; 1/3 before supper Primary Care Method: From scratch: Start 5-10u QD-BID and titrate From other insulins: Calculate approximate amount of basal and prandial units and divide 2/3rd - 1/3rd AM and PM

Pearls Insulin is 2nd line after metformin No need to save it for last! Better than adding a 3rd PO drug Better efficacy, lower toxicity, better studied Improve buy-in from patient: “Natural” supplement Only BID glucochecking at alternating times required: Pre-Breakfast + Post-Breakfast, then Pre-Breakfast + Pre-Lunch, then Pre-Breakfast + Post-Lunch, then Pre-Breakfast + Pre-Supper, then Pre-Breakfast + Post-Supper, then Pre-Breakfast + Pre-Bedtime Repeat

Pearls (cont’d) D/C secretagogues after starting insulin to reduce risk of hypo’s. Eg. Sulfonylureas, meglitinides Black box warning against combo with glitizones! (Actos, Avandia)