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TDM OF DIGOXIN
By,
Surya Prakash singh
ROLL: 12117D3003
pharmD IV th
year
IT'S A CARDIAC GLYCOSIDE
THE SOURCE'S ARE
DIGITALIS LANNATA
DIGITALIS PURPUREA
ITS STRUCTURE
Basic cardenolide with
three digitoxose untis
bound to streroidal ring
by a glycosidic linkage.
DRUG PROFILE OF DIGOXIN
DOSE AND INDICATION
DOSE:
Tablet : 0.125 - 0.25 mg TAB
Injection solution : 0.1mg/ML - 0.25mg/ML
INDICATION:
heart failure
&
atrial fibrillation.
ABSORPTION
BA: 55-90%
ONSET OF ACTION
PO : WITHIN 2 HR
IV : WITHIN 30 MIN
DURATION OF ACTION : 3-4 DAYS
PEAK PLASMA TIME : 1 HR
DISTRIBUTION
PROTEIN BOUND: 20-25%
VD : 4 โ€“ 7 L/KG
METABOLISM
LIVER
ELIMINATIOIN
T 1/2 : 1-3 DAYS
EXCRETION
URINE : 80%
FEACES: 10-15%
MECHANISM OF ACTION OF DIGOXIN
OTHER EFFECTS :
Neuro hormonal effects
โ€ข Decrease sympathic out flow
โ€ข Increase parasympathetic outflow
โ€ข Improve baro receptor functioning
DECREASE HEART
RATE
(NEGATIVE
CHRONOTROPIC
EFFECT)
REASONS FOR TDM OF
DIGOXIN ??????
METHOD OF ASSAY
Radioimmunoassay (RIA) involves the quantitation of drug using a
radioactive probe by measuring the radioactivity correlated to
amount of drug.
The technique was introduced in 1960 by Berson and Yalow
Mixture of radioactive labeled
antigen "hot"
+
antibody
Adding the sample unlabeled
antigen (drug)"cold"
The unlabelled antigen
displaces the labeled ones
(Ag-Ab)Complexes are
removed
Supernatant remains are
analyzed
Gamma Counter
๏‚„ From these data, a
standard binding
curve, like the one
shown in red, can
be drawn.
OTHER METHODS OF ASSAYS
๏‚„ Nucleic acid labeling
๏‚„ Fluorescence labeling
๏‚„ ELISA
๏‚„ High throughput screening wells coated with
antibodies.
THANK YOU

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Tdm of dig

  • 1. TDM OF DIGOXIN By, Surya Prakash singh ROLL: 12117D3003 pharmD IV th year
  • 2. IT'S A CARDIAC GLYCOSIDE THE SOURCE'S ARE DIGITALIS LANNATA DIGITALIS PURPUREA ITS STRUCTURE Basic cardenolide with three digitoxose untis bound to streroidal ring by a glycosidic linkage. DRUG PROFILE OF DIGOXIN
  • 3. DOSE AND INDICATION DOSE: Tablet : 0.125 - 0.25 mg TAB Injection solution : 0.1mg/ML - 0.25mg/ML INDICATION: heart failure & atrial fibrillation.
  • 4. ABSORPTION BA: 55-90% ONSET OF ACTION PO : WITHIN 2 HR IV : WITHIN 30 MIN DURATION OF ACTION : 3-4 DAYS PEAK PLASMA TIME : 1 HR
  • 5. DISTRIBUTION PROTEIN BOUND: 20-25% VD : 4 โ€“ 7 L/KG METABOLISM LIVER ELIMINATIOIN T 1/2 : 1-3 DAYS EXCRETION URINE : 80% FEACES: 10-15%
  • 6. MECHANISM OF ACTION OF DIGOXIN
  • 7. OTHER EFFECTS : Neuro hormonal effects โ€ข Decrease sympathic out flow โ€ข Increase parasympathetic outflow โ€ข Improve baro receptor functioning DECREASE HEART RATE (NEGATIVE CHRONOTROPIC EFFECT)
  • 8.
  • 9.
  • 10.
  • 11. REASONS FOR TDM OF DIGOXIN ??????
  • 12.
  • 13. METHOD OF ASSAY Radioimmunoassay (RIA) involves the quantitation of drug using a radioactive probe by measuring the radioactivity correlated to amount of drug. The technique was introduced in 1960 by Berson and Yalow
  • 14. Mixture of radioactive labeled antigen "hot" + antibody Adding the sample unlabeled antigen (drug)"cold" The unlabelled antigen displaces the labeled ones (Ag-Ab)Complexes are removed Supernatant remains are analyzed
  • 16. ๏‚„ From these data, a standard binding curve, like the one shown in red, can be drawn.
  • 17.
  • 18. OTHER METHODS OF ASSAYS ๏‚„ Nucleic acid labeling ๏‚„ Fluorescence labeling ๏‚„ ELISA ๏‚„ High throughput screening wells coated with antibodies.