Yes. Despite increasing antibiotic resistance, there usually is another antibiotic that can be found. If this is not the case, and there is a serious need for penicillin, many penicillin allergies can be desensitized. This procedure takes place in the hospital and only lasts for the duration of time that you are taking penicillin, but is effective. So in emergencies, there are still options.
Yes. Almost all infections are treatable with non-penicillin antibiotics but if you develop an infection requiring penicillin, then you can be admitted to a hospital to undergo desensitization, a procedure which over a few hours "teaches" your body how to tolerate penicillin. Desensitization will allow you to tolerate a full course of penicillin but once stopped for 24 hours the allergy returns.
Depends. That depends on what infection you're treating.
Skin testing. 90% of pt labelled as PCN allergic are not PCN allergic. PCN skin testing and possible oral challenges can be done to clarify this reported sensitivity.
Lots of Options. Depends on the infection. Certain infections call for different antibiotics. Penicillin drugs are usually first line for most problems, however there are alternatives that can be used. Your doctor would be the best person to talk about what options are right for you. If you are interested in determining if you still have a penicillin allergy, see an Allergist for penicillin skin testing.
Depends. Some people use Cephalexin - recommendations change often, so you should see your doctor and get their suggestions.
Zithromax. Azithromycin (zithromax) is a good option for streptococcal tonsillitis. There is some cross-reactivity between penicillins and cephalosporins (such as keflex), and these would not be my first choice. Many infections are caused by viruses, and in this situation antibiotics are not effective.
PCN allergy. Azithromycin, clarithromycin, erythromycin, cephalosporins or simply get the tonsils taken out.
Covered by insurance. Testing for penicillin allergy involves skin testing to many of the different components of penicillin (major and minor). This testing is relatively painless and can be done in 2-3 hours. Insurance usually covers such testing.
Skin test. The formal means is to have skin testing done by a doctor. The agent is prepared to a standard small dose and injected under the skin. Reaction or not is assessed in a standard time interval.
Test. IN the US there is skin testing available to evaluate PCN allergy. If this test is negative it is usually followed by an oral challenge to amoxil (amoxicillin).