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Doctor insights on: Antibiotics For A Spider Bite

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Best antibiotic for a spider bite infection that was not treated with dicloxicillin?

Best antibiotic for a spider bite infection that was not treated with dicloxicillin?

Unlikely: To have been a spider bite. Most of these (unless you have actually seen and identified the spider as a black widow or brown recluse), are community acquired infection with methicillin-resistant staph aureus (mrsa). Many of these are sensitive to Bactrim (sulfamethoxazole and trimethoprim) or Doxycycline or sometimes clindamycin. Dicloxacillin is unlikely to be effective. ...Read more

Dr. John Leander Po
1,117 Doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more


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Do I need antibiotics for spider bite?

Do I need antibiotics for spider bite?

Spider bite: Spider bites can have variable appearances. It might cause a pink or red bump with no symptoms. Or it could itch or be painful. Venomous spiders may cause significant pain radiating far from the site, cramping, sweating, necrosis of tissue or worse if there is an allergic reaction. You may need antibiotics for signs of infection or significant ulceration. ...Read more

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When is an antibiotic needed for a spider bite?

When is an antibiotic needed for a spider bite?

Boil: I've answered many questions about 'spider bites' today. They are rarely spider bites; they're usually bacterial infections of the skin, most often caused by staph aureus. The usually treatments are with Bactrim (sulfamethoxazole and trimethoprim) or clindamycin. However, by the time they've turned into boils, they may need to be opened and drained. ...Read more

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Which is the preferred antibiotic for brown recluse spider bites?

Which is the preferred antibiotic for brown recluse spider bites?

Dapsone: Ulceration may sometimes be treated or prevented with dapsone. If it becomes infected - likely a wide spectrum antibiotic. ...Read more

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After three rounds of antibiotic (hobo spider bite rt breast) pain increasing while off antibiotics. Help bite jan.7 3 rounds of cephalexin 500

After three rounds of antibiotic (hobo spider bite rt breast) pain increasing while off antibiotics. Help bite jan.7 3 rounds of cephalexin 500

She: She needs a follow up with her doctor asap. There is a possibility that she has a skin infection (cellulitis) that did not respond to the initial antibiotics. Is the area, red, hot, painful? If so then this is likely the case. If it is just painful then there may be some nerve damage from the bite. There are treatments for this as well.
Best of luck. ...Read more

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What is the best antibiotic to treat an infected spider bite?

What is the best antibiotic to treat an infected spider bite?

Boils: What people call 'spider bites' are rarely spider bites; they're usually abscesses (boils). The cause is usually staph. Aureus, including mrsa. Antibiotics like tmp/smx (bactrim), clindamycin, and Doxycycline can be helpful at the early stage, but by the time a boil has formed, they often have to be opened and drained. ...Read more

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What antibiotic should I take for infected spider bite?

I don't advocate: Self care if the lesion is infected. Please have it medically assessed. ...Read more

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After antibiotic treatment, how long before a spider bite will go away?

Depends: Different spiders cause different reactions.
For less toxic spider bite, which are the most common, it usually takes 7-10 days.
To decrease pain and swelling, I have found the use of orally administered steroids to lessen pain and swelling. ...Read more

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Will antibiotics work against spider or bug bites?

Will antibiotics work against spider or bug bites?

Only when infected: Spider bites often get infected and this is when antibiotic use comes into play. When the tissue damage is too severe, a surgeon may even have to cut off the damage tissue. ...Read more

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Do spider bites stop progressing after taking antibiotics?

Do spider bites stop progressing after taking antibiotics?

Only if infected.: Antibiotics should do nothing for a spider bite unless of course it is infected. This is not common, but can happen. I suppose that if you had a spider bite and you took anything and the bite regressed as it was won't to do, you could attribute succes to the ingested agent. ...Read more

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Is the antibiotic cephlaxin good for poison spider / insect bites?

Is the antibiotic cephlaxin good for poison spider / insect bites?

No.: Cephalexin (and all other antibiotics) are prescribed for bacterial infections. Bug bites do not respond to antibiotics unless there is also an infection present, which does sometimes happen if bacteria gets into the bite. Most bites do well with a mild cortisone cream and antihistamines for the itching, but if pain or significant tenderness develops, see your doctor. ...Read more

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Is the antibiotic cephlaxin good for poison spider / insect bites? If not what is?

Is the antibiotic cephlaxin good for poison spider / insect bites? If not what is?

Yes and no: A poisonous insect bite that is not superinfected with bacterial infection will not be helped by antibiotic treatment. If there is bacterial superinfection with streptococcus sp. Or methicillin sensitive staph. Aureus it will improve with cephalexin (keflex) treatment.
This antibiotic is not active against mrsa. ...Read more

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Dr. Put me on antibiotics for my swollen lymphnodes he thinks a spider bite me, how long does it take for my nodes to go down, before im concerned?

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well. ...Read more

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How long and what are the signs that a spider bite is properly healing? I am in antibiotic for it now. It's still purple and puss

How long and what are the signs that a spider bite is properly healing? I am in antibiotic for it now. It's still purple and puss

Paaaaaaarrrrtyyyyy!!: Purple is not on the list of normal skin colors on this planet and pus is normal only if you are a bunch of bacteria having a party on flesh. That means either you're a party-goer from Pluto or you need to get that seen by a doc ASAP. Here on earth, that purple color may mean trouble, so head for a doctor on the double. Your antibiotic ain't workin'--so them bugs have a head start on the party. ...Read more

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My wife was bitten by some sort of insect. It appears to be a spider bite. Red cellulitis that is spreading, center is open draining. What antibiotic?

My wife was bitten by some sort of insect. It appears to be a spider bite. Red cellulitis that is spreading, center is open draining. What antibiotic?

See your doctor: Skin infections are most commonly caused by S. aureus or "staph." The resistant form is known as MRSA. Antibiotic choice depends on the patient's other medical problems but Cephalexin is a common choice for the non-resistant form and Doxycycline and Linezolid are the most effective oral antibiotics for MRSA. Your provider can culture the wound to tailor antibiotics specifically to the infection. ...Read more

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Small, hard, whitish, plug-like mass came out of recluse spider bite while cleaning before dressing. Left a small hole. Is this bad? I'm on antibiotics

Small, hard, whitish, plug-like mass came out of recluse spider bite while cleaning before dressing. Left a small hole. Is this bad? I'm on antibiotics

Keep an eye: Most likely this was the soft tissue that died. Cover it with a bandaid and Bacitracin ointment after a shower. Make sure it doesn't get worse as it shouldn't.
Good luck from NYC. ...Read more

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What treatment at home can be done for black widow spider bite? Which antibiotic is best?

What treatment at home can be done for black widow spider bite? Which antibiotic is best?

Spider Bite: Treatment for serious reactions to a black widow spider's bite will be beyond the scope of most medical offices and urgent care centers. Pain relief may require the use of narcotics and Antivenin (antitoxin to counteract the effects of the spider venom). ...Read more

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I got a spider bite a week ago. By the third day iwas infected. Culture said it was mrsa. Am on antibiotics. How contagious is it for my 18mo old?

I got a spider bite a week ago. By the third day iwas infected. Culture said it was mrsa. Am on antibiotics. How contagious is it for my 18mo old?

Potentially -: The history often recalled by patients diagnosed with community acquired MRSA (ca-mrsa), is that of a " spider bite". If you have an open wound draining pus, you are quite contagious especially if it's not covered and your child touches it. Some recommendations include: 1.Cover the wound, 2. Wash hands thoroughly, 3. Don't share personal items (eg. Towels), 4. Observe excellent hygiene. ...Read more

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Should I start taking antibiotics if I believe I have a spider bite on my foot?

Should I start taking antibiotics if I believe I have a spider bite on my foot?

No: If it just happened, treat with simple wound care including cleansing of the wound, checking tetanus status and watching for signs of progression leading to infection. However, since the foot can become infected very easily, watch for infection very closely. If any doubt, see your doctor. ...Read more

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Possible spider bite culture came back g strep fluid drained have low temp antibiotics. 24 hrs later arm red/swollen hot what is meant by g strep?

Serious: It is possible that the spider bite could be secondary infected by group g strep. Also it could be a primary infection. The condition you are describing is most likely cellulitis caused by group g strep. Please, see you doctor as soon as possible so the appropriate treatment can be started. ...Read more

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My spider bite on my leg is infected and I have been prescribed with antibiotics but it is still very sore and quite swollen. I can't even walk normal?

My spider bite on my leg is infected and I have been prescribed with antibiotics but it is still very sore and quite swollen. I can't even walk normal?

Well: Anybody have the symptoms should seek emergency care at ER can lead to serious complications like requiring Amputation or even joint infection rarely death ...Read more

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My boyfrirnd has a rash in groin area and under armpit he also has been on antibiotics for mrsa and pnemonia caused by a spider bite that had necrosis?

My boyfrirnd has a rash in groin area and under armpit he also has been on antibiotics for mrsa and pnemonia caused by a spider bite that had necrosis?

A lot to consider: MRSA is a type of bacteria, not a diagnosis. Does he have a MRSA pneumonia? How is that related to a brown recluse spider? Which antibiotics delivered how, at what doses, for how long? He must have been very ill. Sounds like he has monilial intertrigo related in part to antibiotics. If this is the case, he will improve with miconazole cream, Castellani's solution, and a single dose of oral flucona ...Read more

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Doc gave me Bactrim (sulfamethoxazole and trimethoprim) for a large spider bite? 8" round. I am very allergic to many antibiotics and afraid to take it. How dangerous is Bactrim (sulfamethoxazole and trimethoprim)?

Bactrim (sulfamethoxazole and trimethoprim): Has been used for decades but there are people who are allergic. No one knows if you are one of them. Here is my question, why didn't you discuss this at the time with your prescribing physician? Personally, I'd be more concerned about my 8 " spider bite. ...Read more

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I have a painful spider bite that is bruising red and swollen with an oozing blister what should I do? A doctor at an urgent care prescribed me antibiotics but I can't tell if they are working

I have a painful spider bite that is bruising red and swollen with an oozing blister what should I do? A doctor at an urgent care prescribed me antibiotics but I can't tell if they are working

May need drainage: "spider bites" aren't usually spider bites. These days they're more often MRSA abscesses (boils). Antibiotics won't help treat an abscess unless you catch it very early; boils usually need to be drained. ...Read more

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My nephew has a spider bite on his left lower leg. It is red, swollen and tender. I'm a nurse and have some antibiotics-Is Septra (sulfamethoxazole and trimethoprim) or Keflex better?

My nephew has a spider bite on his left lower leg. It is red, swollen and tender. I'm a nurse and have some antibiotics-Is Septra (sulfamethoxazole and trimethoprim) or Keflex better?

NEITHER!!!!!!: Spider bites are RARE. He probably has something else. NO ANTIBIOTIC IS OF ANY USE FOR REACTIONS TO SPIDER VENOM!!! Unless he saw and felt the attack, then took the spider for identification, assume it is something else. Brown recluse and black widow spiders in USA are found almost exclusively in the southwest quadrant. Where are you? Ordinary spiders are completely harmless. ...Read more

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Antibotic prescibed by doctor's for spider bites?

One that generally: Covers staph. Generally these are zyvox, doxycycline, bactrim, (sulfamethoxazole and trimethoprim) clindamycin. You have to worry about MRSA infection. Also check your tetanus status. ...Read more

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A spider bit my daughter. I went to Hospital, she was given an Antibiotics IV as well as Augmentum. Will she gets better. The bite is very bad..

A spider bit my daughter. I went to Hospital, she was given an Antibiotics IV as well as Augmentum. Will she gets better. The bite is very bad..

Should be ok...: Most of the spider bites in SA are tissue toxic end will cause a blister and then an ulcer with redness around the wound.
The I.V. and oral treatment should be ok, but follow up with your doctor if not better in 2-3 days.
They take some time. If an abscess form it needs to be treated by your doctor. ...Read more

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What is the best antibiotic for cellulitus? I'm allergic to sulfur and pcn. Spider bit me. Led to staph/cellu. Er dr gave me cleocin (clindamycin phosphate) seems to be good

What is the best antibiotic for cellulitus? I'm allergic to sulfur and pcn. Spider bit me. Led to staph/cellu. Er dr gave me cleocin (clindamycin phosphate) seems to be good

MRSA: Unless you actually saw the spider bite you this is most likely to be an MRSA boil. If the organism is sensitive, Clindamycin is an excellent choice of treatment. If you are getting better continue this for 10 to 14 days. If it recurs you may need to attempt to change nasal carriage and skin colonization. Good luck and get better. ...Read more

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Does spider bites spread?

Not usually: If you are bitten by brown recluse spider bite then the black area can spread. A severe reaction to any arthropod bite can spread. ...Read more