Amoxicillin and Vomiting: What Users Say

• Tex...
• December 11, 2015

Amoxicillin for Pneumonia "I have bacterial pneumonia with 2 spots on my lungs after the flu. Not much nasal involvement. Bad headache, body ache, fever, and chills. Deep dry cough. Started Levaquin by IV at the ER, but within an hour I got hives on my mouth and neck and felt slightly itchy all over, then 3 bouts of projectile vomiting. Then tried Clindamycin but developed hives after 2 days. Both meds helped me feel better, and my headache and fever went away. Now on Amoxicillin-Clav 875, twice a day. Symptoms are very slowly improving. Only a bit of loose stool. Probiotics and a bland diet help."

• Kc2...
• November 29, 2015

For Dental Abscess "Took this for a tooth abscess. Toothache went away but was replaced by other pains. Feels like every muscle in my body is sore, especially the legs and lower back. Throwing up and also have diarrhea. Massive headache. The body ache is so bad I laid in bed crying, and I have a pretty high threshold for pain usually. I cannot seem to get out of bed and cannot find a comfortable position for my legs and back. Also just started having a fever of 99.4 degrees. I took this about 7 to 8 hours ago, not sure if I'd rather have the toothache or these side effects, that's how bad this is. I've taken amoxicillin in the past and did not have any of these problems, not sure what changed (or maybe this is my body's reaction to the abscess?)."

• Anonymous
• January 29, 2018

For Dental Abscess "I started taking amoxicillin immediately. My dentist prescribed it for a toothache. I take 1 twice a day for 10 days. After day one, the pain went away, but I had diarrhea, and I felt very nauseous. Also, I had fever and chills. By the end of the night, I had vomited twice. Day two, I just took a half a pill and still felt dizzy and light-headed. I’ve taken this medication before in the past, and I do not recall this kind of problem. But it knocked out the pain."

• lol...
• Taken for less than 1 month
• October 12, 2019

For Sinusitis "I've taken amoxicillin with clavulanic acid twice before and had awful vomiting and diarrhea. My doctor prescribed it recently without clav (500 mg) to see if that was causing GI problems. Nope. It was the amoxicillin. I took 1 pill with food and water at 6 pm and was violently vomiting at 9:45 for about an hour. I was vomiting so much that my blood pressure dropped so low (83 over something) I almost passed out. Then I couldn't breathe (either from the pill or anxiety about almost passing out). Then the burning stomach cramps and diarrhea started, which was coming out like a fire hose. I ended up calling 911 because I was so sick. Had to give me Benadryl and an IV drip. I will never take this stuff again. I obviously can't handle a single pill of it!"

• Anonymous
• January 22, 2010

For Sinusitis "While it began to work quickly, after 4 doses, I spent the night vomiting every couple of hours and the next day recovering from the side effects. Getting a prescription for something else with fingers crossed that I don't have the same effects."

• Nic...
• Taken for less than 1 month
• March 14, 2019

For Bacterial Infection "I had 4 pre-molars removed to make space for when I got a brace fitted. Thought the procedure would be quite straightforward... anything but! One tooth snapped on the way out, so needed surgery. The other 3 all got infected within 2 days of being pulled. (I had 'monster roots' apparently, which contributed). I got prescribed amoxicillin and metronidazole to help for this dental work. It’s day 6 of taking the antibiotics now, and I’m still unsure if they’ve worked. Although many side effects! Fever, vomiting, itchy skin, headaches, drowsiness, awful metallic taste, low moods. I’ve now lost 14 lbs in weight and I still have the infection. Awful drug!"

• Oti...
• Taken for less than 1 month
• June 15, 2022

For Middle Ear Infections "Otis Media, with a perforated eardrum. I was nervous to take this medicine due to the side effects of nausea, vomiting, and diarrhea. I have GERD, so I was worried I’d be too sick to work or do much of anything. I’m on day four of taking two 500 mg amoxicillin pills twice daily. I have not vomited or felt too sick, just some heartburn here and there. I have had more frequent bowel movements, but nothing too crazy. My ear is not in pain and feels less full, but there’s still some gunk coming out of it. I’ll finish the 10-day course and hopefully the infection will be gone by then. Oh, and ladies, the vaginal itching side effect is very real."

• Anonymous
• Taken for less than 1 month
• November 30, 2021

For Bacterial Infection "After a nasty cold, I ended up with a double ear infection. My doctor prescribed amoxicillin. I suffer from IBS, GERD, and gastritis, so my GI system is very sensitive. Amoxicillin was absolutely horrible. After one dose with food, I was projectile vomiting, had horrible stomach pain, and was throwing up blood. This is one of the worst medications I have ever taken. If you have stomach issues, I would take this with caution. I will never take this again."

• ver...
• Taken for less than 1 month
• July 22, 2015

For Bronchitis "Started to have severe vomiting and diarrhea after just one pill. Spent the day in bed. Tired another pill the next day, same thing: could not eat or drink without throwing up or having to use the bathroom. Stopped taking pills immediately after this. Will try and get better on my own. Lost 5 lbs in 2 days, which I did not need to lose."

• Gar...
• Taken for less than 1 month
• December 5, 2017

For Bacterial Infection "Day one, nauseous. Day two, vomiting. Oh my gosh, day three: diarrhea three times, horrible, and nighttime bad aches and pains. Now I've had sepsis, worst pain ever, say a 10/10. Amoxicillin 6/10 for pain, can't sleep, helps if you sit up at night, try distracting yourself by reading!"

• nic...
• May 24, 2010

"The most common side effects of Amoxicillin include nausea, diarrhea, vomiting, rash, and itching. Among the rarer and more dangerous Amoxil side effects that might be observed are blood disorders and inflammation of the large intestine. As long as the doctor-prescribed dosage of Amoxil is followed, the chances of adverse symptoms appearing are very low. Amoxicillin is generally a very safe medication."

• che...
• Taken for less than 1 month
• December 14, 2012

For Bacterial Infection "Within 4 hours of taking my prescribed dosage, I had severe diarrhea and vomiting. I was miserable for the next 24 sleepless hours."

• Sar...
• March 2, 2012

For Upper Respiratory Tract Infection "Caused severe vomiting, stomach upset, and diarrhea. Unfortunately, I was unable to finish the full course."

• Jam...
• November 7, 2020

For Upper Respiratory Tract Infection "Had vomiting and cramps from amoxicillin."