After taking Sinarest, I noticed my heart beating faster. Has anyone else faced this?

It’s understandable that a fast heartbeat, or palpitation, after taking medication can be alarming! You’re not alone; this is a recognised side effect for some people taking cold and flu medications like Sinarest. Do not take any more doses of Sinarest or any other cold medicine that contains decongestants (like Phenylephrine or Pseudoephedrine) until you’ve spoken to a doctor. Seek immediate medical attention if the fast heartbeat is accompanied by severe chest pain, shortness of breath, severe dizziness, or fainting.
Why It Happens: Sinarest contains a decongestant ingredient called Phenylephrine (a common decongestant). This type of ingredient belongs to a class called sympathomimetics. These medicines work by narrowing blood vessels to reduce nasal swelling and congestion. However, they can also cause a temporary stimulating effect on your body, including your heart, leading to side effects such as:
Fast or irregular heartbeat (palpitations)
Increased blood pressure
Nervousness or restlessness
What You Should Do
Stop the Medication: Do not take any more doses of Sinarest or any other cold medicine that contains decongestants (like Phenylephrine or Pseudoephedrine) until you’ve spoken to a doctor.
Stay Calm and Hydrated: Try to rest, relax, and ensure you are well-hydrated. Sometimes, reducing stress and avoiding stimulants like caffeine can help.
Consult a Doctor: It’s important to get checked. While it’s a known side effect, your doctor needs to confirm the cause and ensure it’s not related to an underlying heart condition. They can also recommend a safer alternative cold medicine for you.