Update on Oral Medications - Pennsylvania Optometric Association

Update on Oral
Medications
Carlo J. Pelino, OD, FAAO
[email protected]
!"#$#%"$&'(")%&*)+,We have no relevant financial relationships
to disclose and no proprietary interest in
any product discussed in this presentation.
Joseph J. Pizzimenti, OD, FAAO
[email protected]
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What pharmacotherapy
means to optometry
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The ability to use pharmaceutical agents
has enabled optometrists to become true
primary health care providers.
Principles of Pharmacology
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• Pharmacokinetics: What the body does to a drug
• Pharmacodynamics: What the drug does to the body
• Always keep in mind the contraindications, side effects and drug
interactions before starting medication.
• Drug risks vs. benefits
• Keep in mind the age and weight of the patient
• Consider starting with one half in the very young or very old
• Elderly may be on multiple meds – may lead to adverse reactions
• Allergy history
Principles of Pharmacology
• Drug
Metabolism – Most drugs metabolized by
liver enzymes
• Drug Excretion – The kidney is the major route
• Some drugs are excreted after metabolism
• Some drugs are excreted unchanged
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Each patient is unique.
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FDA Use-in-Pregnancy Ratings
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Levels of Immunity
Innate Immunity:
First line of defense = external barriers
(skin, mm, lashes)
Second line of defense = phagocytic cells,
proteins, inflammation, fever,
complement system, interferon
Third line of defense = Adaptive immunity
Protects only against a
certain type of pathogen
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Neutrophils / Macrophages
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Questions and Comments?
Types of Pain
Nociceptive
• Expected result from
tissue injury
• Normal neural transmission
Neuropathic
The World Health Organization Pain Ladder
Mild Pain
Oral NSAID , Non Opioid Analgesic
• Primary lesion in the CNS
Moderate
Oral Opioid
• Chronic
Severe
Parenteral Opioids (Morphine)
Intractable
Invasive therapy
• Localized, resolves
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What about Codeine ????
Must be metabolized to morphine to have analgesic
effect
Other metabolites cause nausea and dysphoria
10% of population can not metabolize, so no
analgesic effect
2% are ultra rapid metabolizers – prone to morphine
intoxication at normal doses
Common Opioid Side Effects
Nausea and vomiting
Constipation
Itchiness
Respiratory depression
Mental confusion
Hypersensitivity reactions
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WHAT’S NEW?
• Generic Valtrex, Famvir
s0)('#>!B#$C$30)('D
To Treat Shingles (VZV), Give Double the Dose Used for HSV
Antiviral Drug
Dosing for H. Zoster
Dosing for HSV
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Acyclovir
Valacyclovir
Famciclovir
800mg 5x q.d. x 1wk
1,000mg t.i.d. x 1 wk
500mg t.i.d. x 1 wk
400mg 5x q.d. x 1wk
500mg t.i.d. x 1 wk
250mg t.i.d. x 1 wk
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Source: Review of Optometry 2010 Clinical Guide to Ophthalmic Drugs. Melton and Thomas
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Conclusions
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Thank you!
• The ability to prescribe therapeutic agents
has enabled optometry to establish itself
as a true primary health care profession.
• “With great power comes great
responsibility.”
– Uncle Ben in Spiderman
• Prescribe wisely!
Carlo and Joe