Overview
This article explains when to seek urgent medical help while using weight loss medication prescribed by MedExpress, including specific symptoms that require immediate attention. Use this guidance to recognise serious warning signs and understand when to call 999 or go to A&E without delay.
Use this article when you want to:
Recognise the serious warning signs that need immediate medical attention while using weight loss medication.
Understand exactly when to call 999 or go to A&E without delay.
Call 999 or go to A&E immediately if you experience any of the symptoms below.
What Counts as Severe Vomiting?
Severe vomiting is defined as three or more episodes of vomiting in one day, especially if any of the following apply:
Vomit looks like coffee grounds.
Vomit contains blood.
Vomiting occurs alongside a fever (high temperature).
What Counts as Severe Stomach Pain?
Severe stomach pain includes pain that:
Is very intense (around 8 out of 10 or higher) and makes it hard to focus on anything else.
Makes it nearly impossible to carry out normal daily activities, such as walking, getting dressed, or eating.
Does not improve with rest or over-the-counter pain relief.
Radiates to the back, underneath the right ribcage, or to the right shoulder.
Occurs alongside severe vomiting (three or more episodes in one day).
What Should I Do About Severe Pain Under My Right Ribcage?
Call 999 or go to A&E if you experience severe pain underneath the right ribcage that may spread to the shoulder or back, particularly if it occurs with:
Vomiting.
A high temperature.
A rapid heartbeat.
What Neurological Symptoms Need Urgent Attention?
Call 999 or go to A&E immediately if you experience both of the following:
Dizziness.
Numbness or weakness affecting the face, arms, or legs.
What Breathing or Allergic Symptoms Need Urgent Attention?
Call 999 or go to A&E immediately if you experience:
Difficulty breathing.
Swelling of the lips, tongue, or throat.
These may be signs of a severe allergic reaction.
What Are the Signs of Very Low Blood Sugar in Someone Who Isn't Responding Normally?
In someone who is unresponsive or not behaving normally, signs of very low blood sugar may include:
Dizziness.
Irritability.
Confusion.
Rapid heartbeat.
Sweating.
Call 999 or go to A&E immediately — this is a medical emergency.