Update on Medications and Drug Interactions for the Pediatric Dentist Pamela J. Sims, Pharm.D., Ph. D. Professor Department of Pharmaceutical, Social and Administrative Sciences McWhorter School of Pharmacy Samford University and Adjunct Professor Department of Pediatric Dentistry University of Alabama School of Dentistry
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Update on Medications and Drug Interactions for the Pediatric Dentist
Pamela J. Sims, Pharm.D., Ph. D.Professor
Department of Pharmaceutical, Social and Administrative SciencesMcWhorter School of Pharmacy
Samford Universityand
Adjunct ProfessorDepartment of Pediatric Dentistry
University of Alabama School of Dentistry
Topics
Pharmacokinetic differences between children and adults
Preventing infection Managing behavior Interactions with local anesthesia Treating pain Treating nausea
Pediatric Pharmacokinetic Changes Absorption
– increased pH– Variable motility– Frequent presence of food and/or milk– Affects rate and extent
Distribution
Body composition– Primarily lean body mass– Increased V of water soluble drugs
• increased LD on mg/kg basis
– Decreased V of fat soluble drugs• decreased LD on mg/kg basis
Fluid compartments as a function of age (% of weight)
Age TBW ECF ICF Fat
PrematureNeonate
85 50 33 1-10
Neonate 78 45 35 12-16
4-6months
65 35 37 20-25
Adult 55-60 19 40 >25
Distribution
Altered Protein Binding– Decreased plasma protein concentrations– Lower binding capacity– Decreased affinity
Comparative protein binding of certain drugs
Drug % PB in newborn % PB in adult
Acetaminophen 37 48
Diazepam 84 99
Morphine 46 66
Phenobarbital 32 51
Phenytoin 80 90
Theophylline 36 56
Metabolism
Phase I– Alternative pathways
– Develops slowly• concentration same,
activity reduced
– Affected by diet and drugs
• Inhibitors
• Inducers
Phase II– Glucuronidation
slowest to develop• 3-4 years of age
Excretion
Glomerular Filtration– Neonate
• RBF 5-6% of CO
• 30% of adult
Tubular Secretion and Reabsorption– decreased RBF
– Small, undeveloped tubules
Creatinine not as helpful a predictor of renal function as in adults– still one way of
monitoring nephrotoxic drugs
Preventing Infection
Prophylaxis against endocarditis Prophylaxis for joint replacement patients Prophylaxis for solid organ transplant patients Prophylaxis for immunocompromised patients
– Rheumatoid arthritis
– Type I diabetes
– Lupus
– Oncology patients
Dental Procedures and Endocarditis Prophylaxis Recommended (1997)
– Dental extractions – Periodontal procedures– Dental implant placement and
reimplantation of avulsed teeth– Endodontic treatment beyond apex– Subgingival placement of
antibiotic fibers and strips– Initial placement of orthodontic
bands– Intraligamentary local anesthetic
injections– Prophylactic cleaning of teeth or
implants where bleeding is anticipated
Recommended 2007– All dental procedures
that involve manipulation of gingival tissue or the periapical region of teeth or perforation of the oral mucosa*
Dental Procedures and Endocarditis Prophylaxis Not Recommended (1997)
– Restorative dentistry– Nonintraligamentary local anesthetic
inj.– Post placement and buildup intracanal
endodontic tx.– Placement of rubber dams– Postoperative suture removal– Placement of removable prosthodontic
or orthodontic appliances– Taking of oral impressions– Fluoride treatments– Taking of oral radiographs– Orthodontic appliance adjustment– Shedding of primary teeth
• Unrepaired cyanotic CHD, including palliative shunts and conduits
• Completely repaired congenital heart defect with prosthetic material or device, whether placed by surgery or by catheter intervention during the first six months after the procedure**
• Repaired CHD with residual defects at the site or adjacent to the site of a prosthetic patch or prosthetic device (which inhibit endothelialization)
– Cardiac transplantation recipients who develop cardiac valvulopathy
Cardiac Conditions for which Endocarditis Prophylaxis Not Recommended
Negligible-risk category (no greater risk than the general population) (1997)
– Isolated secundum atrial septal defect
– Surgical repair of atrial septal defect, ventricular septal defect, or patent ductus arteriosus (without residua beyond 6 mo)
– Previous coronary artery bypass graft surgery
– Mitral valve prolapse without valvar regurgitation
– Physiologic, functional., or innocent heart murmurs
– Previous Kawasaki disease without valvar dysfunction
– Previous rheumatic fever without valvar dysfunction
– Cardiac pacemakers and implanted defibrillators
2007– *Except for the conditions
listed, antibiotic prophylaxis is not longer recommended for any other form of CHD
– **Prophylaxis is recommended because endothelialization of prosthetic material occurs within 6 months after the procedure
Prophylactic Regimens for Dental, Oral, Respiratory Tract, or Esophageal Procedures (1997)
Standard generalprophylaxis
Amoxicillin Adults: 2.0 gChildren: 50 mg/kg
1 hour before procedureAllergic to pencillin Clindamycin
orAdults: 600 mgChildren: 20 mg/kg
1 hour before procedure
Cephalexin orcefadroxil
Adults: 2.0 gChildren: 50 mg/kg
1 hour before procedureAzithromycin orClarithromycin
Adults: 500 mgChildren: 15 mg/kg1 hour before procedure
Prophylactic Regimens for a Dental Procedure 2007
Standard general prophylaxis
Amoxicillin Adults: 2.0 g Children: 50 mg/kg
30-60 minutes before procedure
Allergic to pencillin Clindamycin or
Adults: 600 mg Children: 20 mg/kg
30-60 minutes before procedure
Cephalexin**† Adults: 2.0 g Children: 50 mg/kg
30-60 minutes before procedure
Azithromycin or Clarithromycin
Adults: 500 mg Children: 15 mg/kg 30-60 minutes before procedure
Amino-penicillinsBroader Spectrum
Ampicillin Amoxicillin
– 125, 200, 250, 400 mg chewable tablets
– 250, 500 mg capsules– 500, 875 mg filmcoated
tablet– 125mg/5cc, 200 mg/5cc ,
250 mg/5cc, 400 mg /5cc suspension
– 50 mg/ml drop Bacampicillin
(Spectrobid)
Gram + and some Gram - coverage
More stable in GI tract Amoxicillin
– May be taken with food, milk or juice
– Food may delay peak concentrations
Cephalosporins
**or other first or second generation oral cephalosporin in equivalent adult or pediatric dosage.
†Cephalosporins should not be used in an individual with a history of anaphylaxis, angioedema, or urticaria with penicillins or ampicillin
First Generation CephalosporinsGood Gram+, Moderate Gram -
Drug-related Concerns of Penicillin and Cephalosporin Antibiotics
Allergy– Cross-sensitivity between penicillins and cephalosporins. If a
person is truly allergic to penicillin, 10-25% patients will be allergic to cephalosporins. If a person is allergic to cephalosporins, the patient will generally be allergic to penicillins.
Increased bleeding in patients taking warfarin (Coumadin)– Antibiotics can decrease local flora responsible for
synthesis of Vitamin K (Vitamin K is the antagonist to warfarin and warfarin exerts its anticoagulant effects by inhibition of Vitamin K dependent clotting factors)
Drug-related Concerns of Penicillin Antibiotics Decreased efficacy of oral contraceptives
– Today’s low dose BCP’s require endogenous GI flora to conjugate hormone to allow absorption. If bacteria are absent, hormone which prevent egg implantation will be absent. Patients utilizing oral contraceptive agents should use another form of BC during the entire “cycle” in which antibiotics were administered.
– A controlled, pharmacologically induced, minimally depressed level of consciousness that retains the patient’s ability to maintain a patent airway independently and continuously and respond appropriately to physical stimulation and/or verbal command.
– Drugs, dosages and techniques used should carry a margin of safety which is unlikely to render the child non-interactive and non-arousable.
Deep Sedation– A controlled, pharmacologically-induced state of depressed consciousness from
which the patient is not easily aroused which may be accompanied by a partial loss of protective reflexes, including the ability to maintain a patent airway independently and/or respond purposefully to physical stimulation or verbal commands.
General Anesthesia– A controlled, state of unconsciousness, accompanied by a partial or complete loss
of protective reflexes, including ability to independently maintain an airway or respond purposefully to physical stimulation or verbal command.
ADA New Definitions Minimal Sedation
– (Previously associated with anxiolysis and conscious sedation)– A minimally depressed level of consciousness that retains the patient’s
ability to independently and continuously maintain an airway and respond appropriately to physical stimulation or verbal command and that is produced by a pharmacological or non-pharmacological method or a combination thereof. Although cognitive function and coordination may be modestly impaired, ventilatory and cardiovascular functions are unaffected.
• Note: In accord with this particular definition, the drug(s) and/or techniques used should carry a margin of safety wide enough to render unintended loss of consciousness unlikely. Further, patients whose only response is reflex withdrawal from repeated painful stimuli would not be considered to be in a state of minimal sedation.
• When the intent is minimal sedation for adults, the appropriate dosing of enteral drugs is not more than the maximum recommended dose of a single drug that can be prescribed for unmonitored home use.
ADA New Definitions
Moderate sedation– A drug-induced depression of consciousness during which patients
respond purposefully to verbal commands, either alone or accompanied by light tactile stimulation. No interventions are required to maintain a patent airway, and spontaneous ventilation is adequate. Cardiovascular function is usually maintained.
• Note: In accord with this particular definition, the drugs and/or techniques used should carry a margin of safety wide enough to render unintended loss of consciousness unlikely. Repeated dosing of an agent before the effects of previous dosing can be fully appreciated may result in a greater alteration of the state of consciousness than is the intent of the dentist. Further, a patient whose only response is reflex withdrawal from a painful stimulus is not considered to be in a state of moderate sedation.
ADA New Definitions Deep sedation
– A drug-induced depression of consciousness during which patients cannot be easily aroused but respond purposefully following repeated or painful stimulation. The ability to independently maintain ventilatory function may be impaired. Patients may require assistance in maintaining a patent airway, and spontaneous ventilation may be inadequate. Cardiovascular function is usually maintained.
General anesthesia– A drug-induced loss of consciousness during which patients are not
arousable, even by painful stimulation. The ability to independently maintain ventilatory function is often impaired. Patients often require assistance in maintaining a patent airway, and positive pressure ventilation may be required because of depressed spontaneous ventilation or drug-induced depression of neuromuscular function. Cardiovascular function may be impaired.
ADA New Definitions Note: Because sedation and general anesthesia are a continuum, it is not
always possible to predict how and individual patient will respond. Hence, practitioners intending to produce a given level of sedation would be able to diagnose and manage the physiologic consequences (rescue) for patients whose level of sedation becomes deeper than initially intended.
For all levels of sedation, the practitioner must have the training, skills and equipment to identify and manage such an occurrence until either assistance arrive (emergency medical service) or the patient returns to the intended level of sedation without airway or cardiovascular complications.
All areas in which local anesthesia and sedation are being used must be properly equipped with suction, physiologic monitoring equipment, a positive pressure oxygen delivery system suitable for the patient being treated and emergency drugs. Protocols for the management of emergencies must be developed and training programs held at frequent intervals.