Clindamycin Side Effects Lead to Dental Malpractice Lawsuit
Marc Leffler, DDS, Esq.
January 16, 2026
Reading time: 7 minutes

In this case study, dentists will discover how a rushed procedure, antibiotic selection, and non-clinical staff advice led to a malpractice lawsuit and patient harm. This article highlights the importance of informed consent, careful risk management, and keeping patient communications strictly professional.
Key Concepts
- Antibiotic risks and complications in dental care
- Non-clinical staff-patient communication
- Patient choice vs. the standard of care
Underlying facts
D, a 26-year-old man, presented to an endodontist, Dr. Q, on referral of his family dentist, some 6-7 years following his having been struck in the face by a batted baseball. Over the past few months, tooth #8 had begun to darken and become episodically painful. Approximately a week prior to this visit, D developed a pea-sized swelling in the gingiva at the level of the tooth’s apex. Radiographically, a periapical radiolucency on #8 was visible, and the tooth was non-vital. The endodontist suggested endodontic therapy, to which the patient agreed.
Upon entry into the pulp chamber, yellow, foul-smelling purulent discharge exuded through the tooth; the apical swelling immediately reduced in size. The tooth was thoroughly irrigated internally until no pus was visible. Because D was soon going out of town for work for several weeks, he asked the endodontist if she could “just finish it up” that same day, rather than returning a week later as Dr. Q had suggested. Dr. Q acceded. After the filing was completed, obturation with gutta percha was performed by Dr. Q, with the apical extent approximately 1mm short of the radiographic apex. NSAIDs were recommended as needed.
Two days later, D called the office and told the receptionist that he had a sudden increase in swelling and a low-grade fever; the receptionist reassured the patient by saying, “we see this all the time so it’s nothing to worry about,” without having consulted with Dr. Q. Three days after that, while still traveling and with the swelling now approaching the eye, D called the endodontist after hours and spoke directly with her; the patient reported an allergy to Penicillin, so Dr. Q called in a prescription for Clindamycin, which the patient started that same evening.
Now nine days after the initial treatment, the patient again called the office and spoke with Dr. Q, advising her that his facial swelling was much reduced and getting better continually, but he had spasmodic diarrhea; the endodontist told her patient that, as long as the dental symptoms were improving, which they were, he should continue and finish out the antibiotic and take over-the-counter anti-diarrheal medications. The patient did exactly that but ended up in a hospital emergency room a few days later for worsening and uncontrollable diarrhea with severe GI pain, where he was diagnosed with Clindamycin-induced pseudomembranous colitis. He was admitted for IV fluids/antibiotics and supportive care; he was monitored for a potential peritonitis, which never came to pass, and was discharged home after losing seven pounds. D was unable to secure the sales deal he had traveled for, as he was hospitalized during several scheduled meetings; the potential client made the transaction with another vendor.
Legal action
In addition to the physical upheaval that he had experienced, and the medical and hospital bills which were only partially covered by his insurance plan, D was mostly distressed by the fact that he had lost the opportunity for a large sale that he believed would have positioned him for an early-career promotion, with its associated salary increase. He sought out and retained an attorney.
The newly hired attorney forwarded the dental and medical records to two potential experts, an endodontist and a medical infectious diseases specialist. The endodontist was of the views: that under the existing conditions, the root canal treatment should not have been completed in one visit, but acknowledged that this was a judgment call such that other practitioners might well disagree; that if Dr. Q did agree to complete the procedure in one step, as she did, the prescribing of antibiotics at that time would have been preferred, but again recognized that some other endodontists would not agree; that Dr. Q’s providing Clindamycin in the face of a potential Penicillin allergy, in a patient with a worsening infection and unable to be seen clinically, was an acceptable choice, although it was unclear whether Dr. Q adequately discussed the possible GI risks with D; and that the office receptionist was clearly and inappropriately acting beyond her non-professional status in providing the advice that she gave.
The medical expert confirmed that it was clearly the Clindamycin that was responsible for all of the GI symptoms experienced by D, as well as the hospital care that followed, and that the 3-day delay (and worsening infection) created by the receptionist’s advice deprived both D and Dr. Q of the opportunity to have an antibiotic with less severe side effects than Clindamycin to have been used.
D’s attorney opted for a simple litigation approach. On behalf of D, he filed suit against Dr. Q’s practice entity – but not Dr. Q – based upon what the attorney viewed as strong arguments on both the liability and causation fronts as to the practice, with only “judgment call” issues available against Dr. Q. The damages claimed were the GI-based pain and suffering, the unpaid medical costs, the monetary values of the “lost” sale and the “loss” of salary increase. Given that Dr. Q’s practice entity was covered for malpractice, the carrier provided defense counsel to put forth a defense for the practice, working with Dr. Q for that purpose, although not defending her personally.
After depositions were taken, the defense attorney applied to the Court to have the values of the lost sale and potential salary excluded from any potential damages able to be recovered. The Court agreed, determining those amounts to be entirely speculative, in that even if D would have had the chance to attend the meetings he missed, those were merely “opportunities,” so there is no way to prove that he would have been successful in his endeavor. The other claims in the case remained. Realizing the pitfalls of trying to defend the actions of the receptionist, Dr. Q and the practice’s attorney, with the agreement of the carrier, worked toward and completed a settlement on behalf of the practice, for an amount which took care of expenses and physical pain and suffering, with no permanent after-effects, at a far lower value than had lost earnings been included.
Takeaways
In essence, D’s expert endodontist determined that all of the actions taken by Dr. Q – the one-visit RCT, the non-prescribing of antibiotics at that time, and the choice of Clindamycin – were judgment calls, subject to opinions as to appropriateness on both sides of the fence, thereby leading D’s attorney to refrain from pursuing those claims. [We note here that not all attorneys for plaintiffs would approach this in the same way.] Instead, the lawsuit was focused on what D’s attorney viewed as a sole “winning argument,” which was in fact the result. To reiterate a concept discussed in prior case studies, the general principle is that a plaintiff must prove through expert testimony that – with a general standard of “more likely than not” – a defendant dentist departed from good and accepted practice standards, thereby directly causing injury to the patient. For all issues except for the receptionist’s involvement, the endodontist expert for D did not adequately meet that hurdle, at least in the eyes of D’s attorney; the medical expert causally connected the receptionist’s actions with the injuries to D.
There has been and continues to be controversy in the dental community regarding the use of Clindamycin. While its potentially severe side effects are well-publicized, it has therapeutic benefits as well: the classic double-edged sword. We do not comment upon the propriety of a given practitioner’s choice to prescribe it in a particular situation, but just as with all choices, they are best made with a sound and deliberative thought process, so that a defense can be meaningfully put forward if untoward results come to pass.
As a side thought, we visit the issue of a case settling as against a practice entity versus the dentist him/herself; if such a potential ever exists during a malpractice case management, it is something to be coordinated between the dentist, liability carrier, and defense counsel. As a general rule, although potentially with exceptions, payments for professional liability against individual practitioners are reportable to national – and sometimes state – data banks and authorities, whereas those against an entity, as here, are not. To be clear, it is never a given that case resolutions of the type done here can always be made; to the contrary, it is not very common in the world of dental malpractice, with carriers constrained to do so only after an assessment that no specific provider bore any liability. But none of this negates the importance of dental practitioners assuring that dental/medical advice to patients must only be given by dental professionals, leaving only administrative tasks to non-professional staff members.
We end with a brief discussion about dentists acceding to performing procedures that patients “demand,” even when those dentists do not believe that doing so is in those patients’ best interests. Yes, patients have an absolute right to decide which of multiple alternatives they wish to pursue, but only if those alternatives are dentally and/or medically viable. Patients can refuse anything, but they should not dictate what a dentist must do.
Note that this case presentation includes circumstances from several different closed cases, in order to demonstrate certain legal and risk management principles, and that identifying facts and personal characteristics were modified to protect identities. The content within is not the original work of MedPro Group but has been published with consent of the author. Nothing contained in this article should be construed as legal, medical, or dental advice. Because the facts applicable to your situation may vary, or the laws applicable in your jurisdiction may differ, please contact your personal or business attorney or other professional advisors if you have any questions related to your legal or medical obligations or rights, state or federal laws, contract interpretation, or other legal questions.
Additional Risk Tips content

Dental Malpractice Risks in Treating Obstructive Sleep Apnea
Learn how a dentist’s OSA treatment led to malpractice claims. Explore legal risks, informed consent strategies, and key lessons for dental professionals.

IAN Injury After Local Anesthesia: Legal and Clinical Takeaways
Explore a real-world dental malpractice case involving inferior alveolar nerve (IAN) injury after local anesthesia. Learn key risk management principles, the role of informed consent, and how deposition testimony can influence case outcomes.

Canceled Joint Replacement Results from Dentist’s Lack of Awareness
Learn how a dentist’s lack of awareness of new protocols can lead to major inconveniences for a patient.
This document does not constitute legal or medical advice and should not be construed as rules or establishing a standard of care. Because the facts applicable to your situation may vary, or the laws applicable in your jurisdiction may differ, please contact your attorney or other professional advisors if you have any questions related to your legal or medical obligations or rights, state or federal laws, contract interpretation, or other legal questions.
MedPro Group is the marketing name used to refer to the insurance operations of The Medical Protective Company, Princeton Insurance Company, PLICO, Inc. and MedPro RRG Risk Retention Group. All insurance products are underwritten and administered by these and other Berkshire Hathaway affiliates, including National Fire & Marine Insurance Company. Product availability is based upon business and/or regulatory approval and/or may differ among companies.
© MedPro Group Inc. All rights reserved.