medical malpractice, Do i have a legitimate claim?

Assuming that you verbally told the dentist that you were allergic to the antibiotic, and that allergy appeared on your medical history, you DO have a claim against the dentist who prescribed the antibiotic. The law in Pennsylvania is that it is negligence to administer a drug to which a health care provider knew or should have known his patient is allergic. You would be entitled to recover all economic losses, including lost wages, as well as for your pain and suffering and any permanent medical conditions resulting from the organ damage caused by the antibiotic,

It sounds like you have a case worth investigating, although if you have not been permanently injured there will be a question about whether the case is financially viable.  If you want to investigate a case, you should contact a local medical malpractice attorney (one in your state).  They take these cases on a contingency basis which means you only have to pay if you succeed.  Additionally, initial consultations are usually free. You can use the "Find a Lawyer" service through this website to research medical malpractice attorneys.  Then, visit each attorney's website and look for a firm that has a record of successful verdicts.  Below are some articles you may find helpful.  They are written for a New Jersey audience (where I practice) but the ideas discussed in these articles usually apply in most other jurisdictions as well.           Click here for an article that discusses the three main questions I ask when deciding whether to investigate a potential medical malpractice case. This discusses the issue of financial viability. Click here for an article that explains what you can and should expect when pursuing a medical malpractice case. Click here, here  and here for more information about me. Click here for summaries of some of the cases that I have litigated. Click here to review articles that I have published. Since I am a lawyer, I need to advise you of the following when I communicate with you: Please note that by attempting to answer your question, I am not acting as your attorney. I will do nothing further to protect or preserve your interests in the absence of any additional discussion with you about this matter. John Ratkowitz, Esq. Starr, Gern, Davison & Rubin, P.C. 105 Eisenhower Parkway Roseland, NJ 07068 Office: (973) 830-8441 Cell: (732) 616-6278 Fax: (973) 226-0031 Email: jratkowitz@starrgern.com  Click here for my website.