How long is it supposed to it take for antibiotics to work on swollen lymph nodes

Depends

Swollen_glands
If the swollen lymph nodes are from a bacterial infection, then you should notice an improvement in 2-3 days. If they are from a viral infection, antibiotics won't help. And if they are due to another cause and not an infection, antibiotics won't help either.
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Antibiotic Bacteria Bacterial infections Enlarged lymph nodes Infection Swollen glands Viral infections Virus

answered:

Monitoring Centers

Veins
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
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Antibiotic Artery Bacteria Body Cancer Enlarged lymph nodes Immune diseases Inflammation Lymphatic Lymphatic system

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