Medication considerations including safety and its principles in geriatric dentistry
Kuan-Yu Chu1,2*
1Department of Dentistry, Taipei City Hospital Renai Branch, Taipei, Taiwan. 2General Education Center, University of Taipei, Taipei, Taiwan.
Correspondence: Kuan-Yu Chu, Department of Dentistry, Taipei City Hospital Renai Branch, Taipei, Taiwan. [email protected]
ABSTRACT
This article explores the safety and principles of medication in geriatric dentistry. Dental care for older adults is becoming increasingly important in the aging society. However, few attempts have been made to suggest medication considerations in the clinical practice of geriatric dentistry. A clinical literature review on three aspects: aging and pharmacology of drugs, polypharmacy in older adults, and commonly used drugs in geriatric dentistry. The pharmacology of older adults is different from that of the young. Adverse drug reactions (ADR) in older people are often caused by polypharmacy. Odontogenic pain treatment focuses on controlling the cause by non-pharmacological treatment. Additionally, non-steroidal anti-inflammatory drugs (NSAIDs) should be used cautiously in older patients with a history of peptic ulcer, renal, or cardiovascular disease. In cases of contraindications to NSAIDs, acetaminophen is used as an alternative. Moreover, the abuse and unreasonable use of antibiotics can cause antimicrobial resistance. In the case of polypharmacy in older people, the geriatric dentist should pay attention to their current medication and medical history. The dentist should determine the cause, diagnose the patient as soon as possible, and treat the cause of pain with non-pharmacological therapy rather than medication. In addition, the dentist should be familiar with the drugs used, their indications, and ADR. Furthermore, educating older patients about the requirement for medication adherence and regular check on the drug used is necessary to confirm its efficacy and adverse reactions.
Keywords: Geriatric dentistry, Pharmacology, Polypharmacy, Adverse drug reactions
Introduction
Medication guidelines are gradually being established for older adults [1]. At the beginning of the development of pharmacoepidemiology, only case-control studies were performed because of adverse drug reaction (ADR) events before randomized controlled trials. Subsequently, excellent randomized controlled trials effectively eliminated bias and provided strong empirical evidence for drug safety and efficacy [2]. Moreover, the scientific evidence provided by modern simulation models and large data such as Health Data has become a powerful driving force for attempting to solve the problems of clinical epidemiology [3-6]. Based on the premarket review and approval system of drugs, the development of pharmacoepidemiology improves the rational use of drugs [7].
Furthermore, understanding age-related pharmacokinetics and pharmacodynamics, as well as commonly prescribed drugs and their indications and ADR, drug interactions, and oral side effects, can help dentists improve the quality of dental care for older patients [8]. However, few attempts have been made to suggest such medication considerations in the clinical practice of geriatric dentistry. This article discusses the safety and principles of pharmacology in geriatric dentistry from three aspects: aging and pharmacology of drugs, polypharmacy in older adults, and the drugs commonly used in geriatric dentistry. This brief and necessarily oversimplified review can improve our understanding of medication in geriatric dentistry practice.
Aging and pharmacology of drugs
Pharmacodynamics is particularly pronounced for affecting the central nervous system (CNS) and the cardiovascular system. Some drugs may change the number of specific receptor sites with age. Thereby affecting the efficacy of certain drugs [9].
Pharmacokinetic changes in older adults
The absorption, distribution, biotransformation, and elimination of drugs in older adults differed from those of the younger population. Overuse of antacids and proton pump inhibitors increases gastric pH, affects drug solubility, and may reduce drug absorption [10]. In addition, in the elderly, cardiac output decreases, peripheral blood increases, and drug distribution may decrease [11]. If older adults have hepatitis and cirrhosis, the ability of liver cells to proliferate is reduced, and the slower metabolism and clearance rate will lead to the accumulation of drugs in the plasma, thereby increasing their concentration and prone to toxicity [12]. Apart from reducing the first-pass effect of drugs, aging also increases their bioavailability and blood concentrations. Accordingly, when used in older adults, the dose of some drugs, such as propranolol and morphine, needs to be adjusted [13]. In older adults, kidney mass and nephrons decrease, and the average glomerular filtration rate (GFR) and renal blood flow decrease [14]. Antibiotics with minimal kidney damage should be selected for older patients [15]. Older patients with nephropathy should be tested in agreement with the estimated GFR (eGFR), and the dosing frequency should be adjusted [16].
The overall effect of these pharmacokinetic changes in older adults is to increase the duration of a drug's action and its plasma concentration, possibly resulting in increased potency [17].
Polypharmacy in older adults
Polypharmacy refers to using more than five kinds of drugs, which may be due to multiple comorbidities and complex symptoms that require various drugs to control [18]. In a 2015 US study, polypharmacy accounts for 35.6% of older adults aged 76.9 years on average [19]. In mainland China, among older adults aged between 60 and 91 years in the community, the average number of prescription drugs is 10.1 [20]. In Taiwan, the prevalence of polypharmacy among disabled older adults is 81% [21]. Meanwhile, dentists should be very cautious in increasing the items and quantity of medicines when performing dental consultations for older patients in the hospital [22].
Polypharmacy can also lead to ADR and interactions among drugs. When taking one or two kinds of drugs, ADR incidence is reportedly 5.6%–10.0%. When the number increases to more than nine kinds of drugs, the potential drug risk can be as high as 41%, increasing in related bedridden and mortality cases [23]. Dentists should review their past medical history or cloud medication history to check the patient's current medications, their (oral) side-effects (Tables 1 and 2), and any systemic disease in the first dental visit.
Table 1. Commonly current medications and their side-effects in the past medical history of older adults |
||
Drug Class |
Example Drugs |
Side-Effects |
Anticoagulants |
Aspirin [24], warfarin [25] |
Bleeding risks |
Immunosuppressants |
Corticosteroids [26] |
Opportunistic infection [26] |
Chemotherapy drugs |
Combination chemotherapy regimens [27] |
Delayed healing [28] |
Barbiturates |
Valium [29] |
Fall risks |
Bone Stabilizer |
Bisphosphonates [30] |
Delayed bone graft, osteonecrosis |
Table 2. Current medications that may cause oral side-effects in geriatric dentistry [31] |
||
Oral side-effects |
Example Drugs |
Drug Class |
Dry mouth [32] |
Atenolol |
Cardiovascular agents |
Oxybutynin |
Urological |
|
Cyclobenzaprine |
Muscle relaxants |
|
Opioids |
Analgesics |
|
Olanzapine |
Antipsychotics |
|
Tricyclics |
Antidepressants |
|
Fungal infection |
Tetracycline [33] |
Antibiotic |
|
Prednisone [34] |
Immunosuppressant |
Mucositis [33] |
5-Fluorouracil [35] |
Antitumor |
Tooth discoloration |
Minocycline [36] |
Antibiotics |
Dysgeusia |
Glipizide [37] |
Oral hypoglycemic drugs |
Enalapril [38] |
ACE inhibitor |
|
Gingival overgrowth |
Phenobarbitone and Phenytoin [39] |
Antiepileptic drugs |
Nifedipine [40] |
Calcium channel blockers |
|
Cyclosporin [41] |
Immunosuppressant |
|
Stomatitis [35] |
Captopril [42] |
ACE inhibitors |
Lichen-like reaction |
Hydrochlorothiazide [43] |
Diuretics |
ACE= Angiotensin-converting enzyme
High-risk people are malnourished and have kidney or liver disease [44]. Another cause of ADR in older adults is the inability to comply with complex drug regimens [45]. Cognitive function is an independent predictor of antihypertensive medication adherence in older adults living alone [46]. Avoiding harm from potentially dangerous drug interactions by implementing guidelines for antimicrobial use in older patients is important [47]. Polypharmacy and potentially inappropriate medications (PIMs) create major problems with medication use in older adults, and special attention is required in the training of geriatric dentists. Nationally appropriate PIM lists are also needed to reduce the risk of medication used in this population. Comprehensive geriatric assessment effectively reduces the number of prescriptions and daily drug dosage in older patients and optimizes the efficacy of drug therapy [48].
Commonly used drugs in geriatric dentistry
Anesthetics
Local anesthetics
Among the many local anesthetics available for pain management in dentistry, 4% of articaine solutions are indicated for older adults, patients with hepatic impairment, and renal impairment. In the articaine solution (1:200,000), epinephrine concentrations are lower. Hence, adverse effects are minimized in high-risk patients. However, it should not be used for people allergic to sulphite because it contains sodium metabisulfite as a vasoconstrictor's antioxidant [49, 50].
Clinical trials have shown that phentolamine mesylate can help reverse the numbness of the soft tissue caused by local anesthetics, thereby reducing the self-injury of the lips and tongue after the treatment of older patients [51, 52].
General anesthetics (GA)
Considerable dental treatment is needed for adults in sedation and GA [53]. Conscious sedation is a treatment for moderately anxious patients with intolerance to dental care that must be carefully assessed, adequately monitored, and performed in a well-trained as well as well-equipped condition, with an understanding of its limitations [54-56]. In addition, sedation duration was one of the most important factors assessed, depending on the complexity of the dental procedure [57-59].
Conscious sedation can be performed by administering benzodiazepines, such as Midazolam, or inhaling nitrous oxide. Midazolam has a short half-life of 2 hours, rapid onset of action, and rapid recovery, and is associated with anterograde amnesia, thus requiring skill and experience in intravenous and drug administration. However, sedation techniques require special precautions, thereby ensuring a recovery time of at least 1 hour and post-operative medical supervision. However, it involves using a benzodiazepine antagonist (flumazenil) to manage overdose emergencies [60]. In some cases, invasive dental procedures may be useful to combine the administration of drugs to obtain anxiolysis with local anesthesia [61].
Herein, a thorough evaluation of the patient's medical condition is a standard procedure if a dentist plans to use sedatives or general anesthesia as an adjunct to dental treatment [62]. Ghezzi et al. attempt to develop a safe general anesthesia protocol for geriatric dental patients [63]. Meanwhile, according to Prabhu et al., standardized screening tools are recommended to assess suitability for treatment under sedation or general anesthesia in patients with special needs [64]. However, older patients are very sensitive to CNS drugs and are affected by comorbidity, and the effects of sedatives may be more profound and long-lasting. These patients are at high risk for perioperative complications [65] (Table 3).
Table 3. Interactions and adverse drug reactions of central nervous system (CNS) related preparations in geriatric dentistry |
|||
Drug Class |
Common Dental Drugs |
Interacting Drugs |
Potential Adverse Effects |
Anti-Inflammatory/Anesthetic |
Prednisone |
Acetaminophen, NSAIDs |
Hepatotoxicity [66] |
Lidocaine |
Beta-blockers [67], H2-blockers [68] |
Elevated blood levels lead to toxicity |
|
Vasoconstrictor |
Epinephrine [69] |
MAOIs, beta-blockers |
High blood pressure |
Sedative |
Diazepam [70] |
CNS depressants |
Respiratory depression, falling risk |
NSAIDs= Non-steroidal Anti-inflammatory Drugs; MAOIs= Monoamine oxidase inhibitors
Analgesics
Odontogenic pain treatment reduces pain by controlling its causes, primarily inflammation. Analgesics should be used as symptomatic pain treatment, and the prescribed dose should be based on the pain severity and the patient's medical history. Acetaminophen and NSAIDs are commonly used for mild to moderate pain in dental practices. Opioids are best avoided in older patients because of their association with severe ADR [71].
Acetaminophen
It is thought that acetaminophen's mechanism of action is via inhibition of COX-3, or cannabinoid receptors in the CNS, that slow transmission of pain signals to the brain. It can also be used to reduce fever but has no anti-inflammatory effect. The recommended dose for adults is 500 mg once every 4–6 h with a maximum daily dose of 4 g [72]. Acetaminophen is the preferred alternative for patients' contraindications to non-steroidal anti-inflammatory drugs (NSAIDs) [73]. When acetaminophen is combined with enzyme inducers (such as alcohol, barbiturates, carbamazepine, Phenytoin, primidone, and rifampin), the risk of toxicity increases [74]. Evidence shows that oral warfarin anticoagulation therapy can be enhanced by acetaminophen, and reducing the dose by half is recommended [75]. However, acetaminophen is one of the leading causes of drug overdose and acute liver failure worldwide. Hepatotoxicity results from the ingestion of a single overdose or accidental treatment [76]. The liver injury caused by acetaminophen is due to the oxidative stress induced by N-acetyl-p-benzoquinone imine, a toxic metabolite formed by drug oxidation [77].
NSAIDs
NSAIDs have anti-inflammatory and analgesic properties and are the most commonly used first-line drugs for toothache and post-operative treatment [78]. NSAIDs include ibuprofen, naproxen, and ketorolac. NSAIDs should be used cautiously in older patients with a history of peptic ulcer disease and those with renal and/or cardiovascular disease [79-81] (Tables 4 and 5).
Table 4. Side-effects of NSAIDs and muscle relaxants in geriatric dentistry [82] |
||
Drugs |
Rationale |
Recommendation |
Diclofenac Ibuprofen Ketoprofen Mefenamic acid Naproxen |
Higher risk of upper gastrointestinal ulcers, major bleeding, or perforation in patients > 75 years old or taking oral or parenteral corticosteroids, anticoagulants, or antiplatelet drugs; about 1% of patients who use the drugs for 3–6 months; and about 2%–4% for patients who use the drugs for a year. Increased blood pressure and induced kidney damage. |
Avoid long-term use unless other alternatives are ineffective. Patients can take gastroprotectants* to reduce but not eliminate the risk. |
Carisoprodol Cyclobenzaprine |
Some have anticholinergic side effects, sedative effects, and increased fracture risk. |
Avoid |
NSAID= Non-steroidal Anti-inflammatory Drugs
* Proton-pump inhibitor or misoprostol
Table 5. Drugs and recommendations for drug–drug interactions with NSAIDs in geriatric dentistry [82] |
||
Drug Interaction |
Rationale |
Recommendation |
Oral corticosteroids |
Higher risk of peptic ulcer disease or gastrointestinal bleeding |
Avoid use. If necessary, provide gastrointestinal protection. |
Warfarin |
Higher risk of bleeding |
Avoid if possible. If used together, monitor closely for bleeding. |
NSAIDs= Non-steroidal Anti-inflammatory Drugs
NSAIDs reduce renal blood flow, tubular drug excretion, and prostaglandin production. They also attenuate diuretics, beta-blockers, angiotensin-converting enzyme inhibitors, and other antihypertensive drugs [83]. The use of NSAIDs should be avoided in patients with chronic kidney disease stage four and above (creatinine clearance < 30 mL/min) because they increase the risk of acute kidney disease, renal impairment, and further organ decline [84].
Ibuprofen has a relatively low risk of cardiovascular adverse effects among NSAIDs and is recommended for treating mild to moderate toothache [85].
Diclofenac potassium is more effective than acetaminophen or ibuprofen in reducing post-operative pain associated with tooth extraction or deep-cavity preparation. The use of preoperative analgesics minimizes the degree of pain in older patients [86].
Antibiotics
Older people are more susceptible to microbial infections. In addition, comorbidities such as diabetes and medications can affect the disease severity and response to treatment [87]. Besides special considerations such as preventing infective endocarditis, antibiotic prophylaxis should be limited to established guidelines to avoid the risk of antibiotic resistance, toxicity, and excess costs [88]. Meanwhile, based on currently available evidence, prophylactic antibiotics are recommended for surgical extraction of third molars, comminuted mandibular fractures, temporomandibular joint replacements, complex implants involving transplants or multiple implants, and clean-contaminated tumor resections [89]. The types of antibiotics most commonly used in dentistry are Penicillin, Cephalosporins, Clindamycin, Azithromycin, Clarithromycin, Metronidazole, Erythromycin, and so on [90-93].
Penicillin
The most common types of penicillin used to treat odontogenic infections are penicillin V, amoxicillin, and amoxicillin/clavulanic acid. About 10% of the population may have some allergic reaction to the drug; however, 90% are tolerant to penicillin. Clindamycin may be used instead of penicillin if the patient has a history of allergies to the drug or has a positive skin test [94].
Amoxicillin is the most commonly prescribed antibiotic [95]. Dentists also often use amoxicillin in combination with metronidazole or Amoxicillin with Clavulanic Acid (co-amoxiclav) amoxicillin/clavulanate to treat odontogenic infections [96]. In Germany, co-amoxiclav is the second most used antibiotic in dentist prescriptions [97]. For severe odontogenic infections such as abscesses and pulpitis, high-dose co-amoxiclav(875/125 mg every 12 hours) is an appropriate choice [98]. However, the drug may cause some degree of hepatotoxicity. Furthermore, it can alter the normal microbiota of the oral gastrointestinal tract, thereby causing candidiasis and even clostridium difficile infection [99].
Cephalosporin etc.
Cephalexin and Cefazolin are the most commonly used first-generation cephalosporins in dental practice [100]. Both can be used in penicillin-allergic patients. In clinical practice, the probability of allergic reactions caused by cephalosporins is lower than that caused by penicillin [101]. Meanwhile, Cefazolin is as effective as anti-staphylococcal penicillin, ASP, but less nephrotoxic [102].
The first consideration for treating simple cellulitis is methicillin-sensitive Staphylococcus aureus, MSSA 1 g Cefazolin (IV) every 6 hours. If methicillin-resistant S. aureus, MRSA is suspected based on previous culture results, replace with clindamycin 600 mg IV every 8 hours or vancomycin 1 g every 12 hours IV. The dose is adjusted based on age, weight, and renal function. When skin pus is obtained, or other infection sites are simultaneously infected, antibiotics are selected based on Gram stain results [103].
Tetracyclines can help fibroblasts attach to the root surface [104]. Tetracycline is recommended for periodontal disease, marginal attachment, and bone graft enhancement. However, tetracycline should not be prescribed for patients with active liver diseases [105]. Clindamycin, broad-spectrum lincomycin, may be prescribed in cases of persistent infection because it is more potent than penicillin and metronidazole [106]. Its properties include bacteriostatic action, inhibition of bacterial protein synthesis, enhancement of neutrophil chemotaxis, and phagocytosis, recommended for periodontal therapy [107]. In addition, this drug is contraindicated in cirrhotic patients and patients with a history of ulcerative and pseudomembranous colitis [108].
Azithromycin shows potent inhibition against Porphyromonas gingivalis [109]. Injecting 0.5% azithromycin gel into periodontal pockets improves the patient's clinical condition [110]. Clarithromycin is a new generation of erythromycin [111]. It is a logical prescription medication for endodontic and periodontal infections [112]. However, Clarithromycin is generally not recommended as first-line therapy but is only used instead of penicillin in patients who cannot tolerate penicillin therapy [113].
Meanwhile, metronidazole combined with amoxicillin can cover most oral bacteria [114].
Moreover, it has shown efficacy in periodontal therapy to improve clinical outcomes of scaling and root planning [115]. Metronidazole can interact with certain drugs, such as alcohol, disulfiram, warfarin, and hydantoin anticonvulsants, causing nausea, vomiting, and abdominal cramp. Furthermore, it can cause serious side effects in some patients, such as seizures, anesthesia, or paresthesia of the limbs in certain patients [94].
Moxifloxacin is a fourth-generation Fluoroquinolones class of drugs. It is a good choice for treating odontogenic and periodontal infections because of its high penetration capacity through periodontal and bone tissue [116]. However, moxifloxacin is not used as a first-line treatment because of its high price and is often prescribed only when first-line antibiotics and surgical procedures have failed [117].
Pseudomembranous colitis is the main complication of antibiotic therapy in older patients and is associated with high mortality (Table 6). Meanwhile, considering that overuse of antibiotics may increase the risk of resistance [118], dentists should gain insight into the role of antibiotic stewardship in oral health importance and use properly prescribed antibiotics based on the guidelines [119].
Table 6. Interactions and adverse reactions induced by antibiotics in geriatric dentistry |
|||
Drug Class |
Common Dental Drugs |
Interacting Drugs |
Potential Adverse Effects |
Antibiotics |
Cephalosporins, Metronidazole |
Warfarin [120] |
Bleeding risk |
|
Phenytoin [121] |
Increased blood levels of Phenytoin |
|
|
Cephalosporins and metronidazole |
Alcohol [122] |
Disulfiram-like reaction |
|
Erythromycin or Tetracyclines |
Digoxin [123] |
Increasing digoxin metabolism |
|
Tetracycline, etc. |
Aluminum, calcium, and sodium [124] |
Desorption of antibiotics |
Antifungal agent [124] |
Ketoconazole |
Alcohol [125] |
Disulfiram-like reaction |
Fluconazole [125] |
Warfarin [126] |
Bleeding risk |
|
Glyburide [127] |
Hypoglycemia risk |
Hemostatic agents
Patients treated with chitosan dressings as a dental hemostatic agent all had better healing and pain control than controls [128]. Chitosan remains effective in patients with anticoagulant use and is safe for patients with cirrhosis [129].
Studies have shown that although sutures are effective, platelet concentrates leukocyte-platelet-rich fibrin (L-PRF) and advanced platelet-rich fibrin (A-PRF+) are better at promoting coagulation and healing [130].
Tranexamic acid (TXA or Transamin) is a synthetic lysine analog-like antifibrinolytic agent [131]. TXA has hemostatic and anti-inflammatory pharmacological effects and is used by injection or oral administration [132]. Bromelain (Cysteine; trade name, Broen C) significantly reduces pain, edema, inflammation, and platelet aggregation and enhances antibiotic ability, which is beneficial for post-operative healing. This agent should not be used in patients with cases of peptic ulcer, severe liver and kidney dysfunction, or blood coagulation insufficiency [133]. The combination of bromelain and sodium hypochlorite in root canal therapy can reportedly enhance the disintegration action of the pulp [134].
Conclusion
Dentists should know a patient's medical history before prescribing medicine (whether the disease, such as liver disease or kidney affects the drug or if the current medicine presents possible ADR, side effects, or oral symptoms). The cause and diagnosis should be determined as soon as possible. The cause should be treated with clinical dental procedures or non-pharmacological treatment, and antibiotic drugs should be avoided as much as possible. Dentists should be familiar with the medications such as NSAIDs, used by older patients with peptic ulcers, including their indications and contraindications. The lowest dose should be used first. On the other hand, the hearing, vision, and cognitive ability for adherence of older adults and their body weight should be considered to determine the appropriate dose. Drugs should be regularly checked to confirm their efficacy, ADR, and side effects. If necessary, eGFR should be studied.
Acknowledgments: None
Conflict of interest: None
Financial support: None
Ethics statement: None
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