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Doctor insights on: Allergic To Penicillin Can I Use Doxycycline

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Is Doxycycline as effective as penicillin with syphilis I am allergic to pen. Also how long does it take for the doxy to work am infectious while on it?

Is Doxycycline as effective as penicillin with syphilis I am allergic to pen. Also how long does it take for the doxy to work am infectious while on it?

Just as effective: Yes, doxycycline is just as effective as penicillin, but you must take all of the pills more or less on time. You're probably non-infectious after a few days, but best to avoid sex until after completing the entire 2 weeks of treatment. ...Read more

Dr. Tiffanie Noonan
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Suffering from lupus, allergic to penicillin, and was prescribed doxycycline. How safe is it to take this?

Suffering from lupus, allergic to penicillin, and was prescribed doxycycline. How safe is it to take this?

Safe: There is no relation between penicillin and doxycyclin, you can take it, they are from separate classes of medications. ...Read more

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Regime for doxycycline to treat mild tetanus? F, 22, 135 pounds. Allergic to penicillin, had reaction to metronidazole after 3 days. Real advice plz

Regime for doxycycline to treat mild tetanus? F, 22, 135 pounds. Allergic to penicillin, had reaction to metronidazole after 3 days. Real advice plz

Cannot advise: The replies in this forum are limited to answers to general medical questions and for educational purposes. Diagnostics and treatment recommendations are deferred to your primary healthcare provider. I hope you are feeling better soon. ...Read more

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Is there doxycycline in penicillin?

Is there doxycycline in penicillin?

No: Penicillin does not contain doxycycline, and there is no cross-reaction between Doxycycline and penicillin for most penicillin allergic patients. ...Read more

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Is doxycycline as effective towards treating syphilis as the penicillin injections?

Yes, but unreliable: Doxycycline is very effective against syphilis, but must be taken for a full 2 to 4 weeks, depending on syphilis stage. Many people have trouble sticking to treatmet that long without missing many doses, therefore doxycycline is not normally recommended in treating syphilis. However, it is used sometimes in people who are allergic to penicillin. ...Read more

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Can you tell me if doxycycline or vantin (cefpodoxime) is a penicillin or ethromycin?

Can you tell me if doxycycline or vantin (cefpodoxime) is a penicillin or ethromycin?

Neither: Vantin (cefpodoxime) is a cephalosporin: not a penicillin, but somewhat related. Doxycycline is a type of tetracycline, completely unrelated to both penicillins and macrolides (the class of drugs that Erythromycin belongs to). ...Read more

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3 years ago, I had chlamydia. Got penicillin shot, and 2 weeks of twice daily doxycycline. The first 4 days, I puked after first pill. Should I worry?

3 years ago, I had chlamydia. Got penicillin shot, and 2 weeks of twice daily doxycycline. The first 4 days, I puked after first pill. Should I worry?

No: Nausea and vomiting are unfortunate side effects of antibiotics. Doxycycline is one of the antibiotics that can commonly have that side effect in some people. Make sure that you do not mention it as an allergy but rather side effect since it could limit useful antibiotics used commonly for various infections. ...Read more

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With Cefzil & rocephin (ceftriaxone) I get hives. Should I take penicillin shot for syphilis treatment. This is a 3rd infection. Used doxycycline for first 2.

With Cefzil & rocephin (ceftriaxone) I get hives. Should I take penicillin shot for syphilis treatment. This is a 3rd infection. Used doxycycline for first 2.

Condoned: Penicillin is still the first line treatment for syphilis. The most effective treatment for syphilis is not to get it, use a condom. The more often you get it, the greater your risk for antibiotic resistance. Also, with this being your third episode, you are now at high risk of contracting chlamydia and HIV. You need to get tested for those too. Stop playing Russian roulette with your life. ...Read more

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I am getting dehydrated no reason. Went to urgent care on feb 27 urinary tract inf. No fever. He gave me doxycycline 2 times a day I have horrible drug allergies can only take levaquin avelox penicillin cannot take sulfa or macrobid. He gave me doxycycl

I am getting dehydrated no reason. Went to urgent care on feb 27 urinary tract inf. No fever. He gave me doxycycline 2 times a day I have horrible drug allergies can only take levaquin avelox penicillin cannot take sulfa or macrobid. He gave me doxycycl

Dehydration: Dehydration can occur easily when a patient has an infection. An infection can cause a fever, even when the patient isn't always aware, and the skin flushes, with more fluid evaporating. In addition, if a patient isn't feeling well, they often don't drink or eat as much as they typically do. Patient's who are on other medications, including cardiovascular medications, can be more sensitive to the effects of dehydration. Signs of allergic reaction to a medication usually includes rash that is usually hives, swelling, itching, or shortness of breath. ...Read more

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Is doxycline strong enought to kill gonorrhea virus I'm allergic to penicillin?

Is doxycline strong enought to kill gonorrhea virus I'm allergic to penicillin?

Not reliable: Many gonorrhea bacteria are resistant to the tetracycline antibiotics, including doxycycline; it is never recommended as the sole treatment for gonorrhea. Recommended treatment is an injection of ceftriaxone (Rocephin), which is entirely safe in almost everyone with penicillin allergy, plus either azithromycin or doxycycline by mouth. But never doxycycline alone. ...Read more

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I took clarithromycin for chest infection for 4 days, my chest got cleared out but I developed tonsillitis. Doctor gave me doxycycline for it as I am allergic peniccilin. Next day I developed rash all over my body. Which antibiotic I am allergic to?

I took clarithromycin for chest infection for 4 days, my chest got cleared out but I developed tonsillitis. Doctor gave me doxycycline for it as I am allergic peniccilin. Next day I developed rash all over my body. Which antibiotic I am allergic to?

Mgt: There are many causes of a rash, but you may have had an allergic reaction to the antibiotic. If you experienced symptoms such as itchiness or wheezing, these are also symptoms of an allergic reaction.
The other causes include viral and bacterial infections. Please ask your PCP, and you may need another prescription for another antibiotic. ...Read more

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I had vrdl 1:64. I got 1 penicillin 1.2 shot. I took 2 tablets of doxycyline hyclate for 2 weeks everyday. Is this enough to cure my syphilis. Am hiv-?

I had vrdl 1:64. I got 1 penicillin 1.2 shot. I took 2 tablets of doxycyline hyclate for 2 weeks everyday. Is this enough to cure my syphilis. Am hiv-?

No way to tell: These are syphilis tests, not HIV tests. Please do yourself a double favor: (1) get a good HIV test now from your physician; (2) be a responsible lover and always use barrier protection from now on. Best wishes. ...Read more

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I am being prescribed doxycyline for a week for sinus infection. I leave to Hawaii in 7 days and WILL be in the sun. Because I have a penicillin allergy my antibiotics options are limited. Should I be worried about sun exposure? I will not be able to

I am being prescribed doxycyline for a week for sinus infection. I leave to Hawaii in 7 days and WILL be in the sun. Because I have a penicillin allergy my antibiotics options are limited. Should I be worried about sun exposure? I will not be able to

Sun sensitivity: Unfortunately your statement was cut off. If you will be unable to avoid the sun then perhaps you should find an alternative to the doxycycline which has a significant incidence of sun sensitivity. Otherwise I would recommend that you cover up and use broad-spectrum sunblock. You should check with the physician who wrote the prescription. A viral URI may not require antibiotics. ...Read more

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Can I use doxycycline for diverticulitis? Allergic to sulfa and penicillin and unable to tolerate cipro/flagyl. Have not tried doxycycline.

Can I use doxycycline for diverticulitis? Allergic to sulfa and penicillin and unable to tolerate cipro/flagyl. Have not tried doxycycline.

Yes, one of the opti: But you should also try to find out whether you are allergic or intolerant to Flagyl or Cipro. Seek the help of an allergist since diverticulitis tends to recur. And doxycycline may or may not work the next time. ...Read more

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I'm very allergic to penicillin and sulfa. I've been prescribed doxycycline and metronidazole to take post op for a hysterectomy. Are they safe for me?

I'm very allergic to penicillin and sulfa. I've been prescribed doxycycline and metronidazole to take post op for a hysterectomy. Are they safe for me?

Yes: As long as you are not allergic to them and avoid alcohol while taking metronidazole. Also avoid spending too much time in the sun on doxycycline (usually not an issue in winter, but if you live in a tropical climate you could get a sunburn even if you have dark complexion). Everything in life has risks vs benefits. The benefits of your meds are better than the risk of infection so I would take! ...Read more

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I am allergic to penicillin, can other antibiotics be used to treat syphilis?

I am allergic to penicillin, can other antibiotics be used to treat syphilis?

Yes: It is known that 60-70% of those thought penicillin allergic are not, skin testing in a protected setting can usually provide more accurate status. Nontheless, the drug Doxycycline given over a 2 wk period may cure syphillis, Azithromycin has been used but some resistant strains have been found. Penicillin is the only drug known effective during pregnancy & can be used with rapid desensitization. ...Read more

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If I am allergic to penicillin, can I take tazocin?

If I am allergic to penicillin, can I take tazocin?

Piperacillin/tazobac: This compound contains a penicillin derivative and if you have a documented allergy to penicillin you should never ever take this drug. ...Read more

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If I'm allergic to penicillin can I take ceftin (cefuroxime)?

If I'm allergic to penicillin can I take ceftin (cefuroxime)?

Probably: There's about a 15% chance that you'll be allergic to ceftin (cefuroxime). If your penicillin allergy was life-threatening, you shouldn't take the risk, but if you just developed a rash, it's fine to try the ceftin (cefuroxime). ...Read more

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I am allergic to penicillin, can other antibiotics be used to treat meningitis?

I am allergic to penicillin, can other antibiotics be used to treat meningitis?

Yes: Meningitis is a very serious infection requiring close medical attention. Viral meningitis is most common is not treated with antibiotics. If one has bacterial meningitis, this is a medical emergency. If allergic to penicillin, other antibiotics can be used. In certain indications, one can be desensitized to penicillin. ...Read more

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Allergic to penicillin can I take keflex?

Likely, not certain: The majority of people who are told they are allergic to penicillin are not actually so (they get rashes for other reasons, e.g.). Of those that are allergic, about 70% or more will lose the allergy after about 10 years. If you are still allergic, there is about a 10% chance of cross-reaction to 1st-gen cephalosporins like keflex. An allergist can perform testing to judge your risk for a reaction. ...Read more

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I'm allergic to penicillin, can I take keflex?

I'm allergic to penicillin, can I take keflex?

Maybe: Penicillins (like amoxil) & cephalosporins (like keflex) are both beta-lactam antibiotics named because of their ringed chemical structure. Allergy to penicillins is sometimes directed against this ring, and an allergic reaction may also occur if a similar antibiotic is taken. It is estimated that about 10% of penicillin-allergic patients are also allergic to cephalosporins like keflex. ...Read more

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