Skip to main content

Bontril Slow Release and Headaches: What Users Say

Headaches: mentioned by 6 users (15.8%)

Based on user experiences from 38 Bontril Slow Release reviews, the following table shows the most commonly mentioned side effects.

All user comments are moderated by Drugs.com. Each review is verified for relevance and screened for inappropriate content. Side effects are user-reported and not clinically verified.

headaches 15.8%
insomnia 15.8%
anxiety 7.9%
constipation 7.9%
dry mouth 7.9%

Reviews for Bontril Slow Release

Commonly mentioned side effects
  • Bes...
  • January 17, 2011

For Weight Loss (Obesity/Overweight) "I have been on Bontril since December 28th, 2010. I am pleased to say that I have lost 7 pounds the first week and 6 pounds the second week, and tomorrow will be 3 weeks and I have lost 3 this week. In total, I have lost 16 pounds so far. I have experienced dry mouth, suppressed appetite, and headaches. However, none of them bad enough to make me stop yet. When I look in the mirror, I am so pleased. I started out at 171 pounds and now am at 155 pounds. Every day I am excited to see what my scale says once I get up. I would recommend this to anyone that needs to lose weight. LOTS of WATER will make you feel full, so it is very much needed. I haven't been able to exercise yet due to an injury in my back."

10 / 10
Was this helpful?YesNo
94 Report
  • Jod...
  • Taken for less than 1 month
  • July 11, 2013

For Weight Loss (Obesity/Overweight) "I started Bontril on 6/17/13. The first week, I lost 10 lbs. I eat cleanly and exercise 3 days a week. Side effects include insomnia only if I don't exercise, decreased appetite, increased energy, a slight headache. I haven't lost any additional pounds."

7 / 10
Was this helpful?YesNo
81 Report
  • ggm...
  • August 29, 2010

For Weight Loss (Obesity/Overweight) "I have only used this medication once, and it was amazing for controlling my appetite, even better than phentermine. However, I have migraines and am being treated for them with Topamax. I had a mild headache before taking the Bontril, and after taking the Bontril, the headache only got worse throughout the day. My energy and mood were terrific, appetite was suppressed. I had total control of what I ate all day and night. When night came, I was in terrible pain with my migraine. None of my usual rescue medicines worked (Imitrex). I was getting nervous, come bedtime, I was restless, could not sleep, had a terrible migraine all night long, like the Bontril wouldn't wear off. I almost went to urgent care for my head since Imitrex was not working."

5 / 10
Was this helpful?YesNo
50 Report
  • goo...
  • February 7, 2008

For Weight Loss (Obesity/Overweight) "I have been taking Bontril 105 for 6 months now. I have lost a total of 40 lbs, but I am not the strictest of people. I have changed my diet a lot but still have days where I cheat and eat bad things. Went through 3 kinds of pills before I got to this one due to headaches daily."

7 / 10
Was this helpful?YesNo
49 Report
  • Anonymous
  • October 20, 2010

For Weight Loss (Obesity/Overweight) "I've been taking Bontril SR (105 mg) for 30 days. The 1st week I lost 7 lbs and the 2nd week I lost 3 lbs and none since. The 1st week I had tons of energy and a significant decrease in appetite. The 2nd week my appetite started to come back and the energy was gone. I now have almost the same appetite as before, although I do get full a little quicker. Went to the doctor today to get a refill. Going to try 1 more month. I did follow the 1200 calorie diet and drank lots of water the 1st 2 weeks. It is hard to restrict calories now that the hunger is back. As far as side effects, I did experience headaches, insomnia, and dry mouth for a few days, but that has gone away. I was also irritable that 1st week. Now the only side effect is dizziness if I don't drink enough water."

8 / 10
Was this helpful?YesNo
43 Report
  • Cec...
  • July 8, 2009

For Weight Loss (Obesity/Overweight) "I lost 6 pounds in the first week of taking Bontril, then no more loss. I didn't have cravings at first, but after 3 weeks, I am hungry again. Headaches are gone, still doing the diet, but nothing happens. I will finish the first bottle and see if it is worth it to start a second. I had high expectations."

7 / 10
Was this helpful?YesNo
26 Report

Are you taking this medicine?

Your review helps others make informed decisions.
Write a review
Reviews may be edited to correct grammar/spelling or remove inappropriate content. Reviews appearing to come from parties with a vested interest are not published. This information is not intended to endorse any medication and should not replace the expertise and judgment of healthcare professionals.