Common side effects of pseudoephedrine hydrochloride include nervousness, restlessness and trouble sleeping, according to Drugs.com. Less common side effects include headache, nausea, trembling and trouble urinating.
Most side effects of pseudoephedrine hydrochloride do not need medical attention unless they continue or cause concern. However, people who experience seizures, hallucinations, trouble breathing or an irregular heartbeat while taking this medication should check with a doctor or nurse as soon as possible. These side effects are rare and usually occur when taking a high dose of pseudoephedrine hydrochloride, as reported by Drugs.com.
In addition to the other side effects, symptoms of pseudoephedrine hydrochloride overdose include fast breathing, an increase in blood pressure, a slow or fast heartbeat, and severe shortness of breath, as reported by Drugs.com. People who experience these side effects should stop seek medical attention from a doctor or nurse as soon as possible.
Some people experience increased sweating, dizziness, paleness or weakness while taking pseudoephedrine hydrochloride, according to Drugs.com. These side effects sometimes disappear as the body gets used to the medication. A health care professional can give advice that prevents or reduces these side effects. People taking pseudoephedrine hydrochloride should seek medical advice if these side effects continue.