While generic Tenormin tablets are safe, they do have a few unwanted side effects. Some people may develop dizziness, slow heart rate, tiredness, diarrhea, nausea, vomiting or muscle cramps which usually ease of as the individual gets used to the medication. In very rare cases, some individuals may feel a cold sensation in their extremities. To avoid developing dizziness, it is highly recommended that one get up slowly when lying down. Tenormin should only be taken as prescribed by your local health care professional. If you somehow miss a dose of Tenormin, do not double the dose the next day. If only a few hours have elapsed since the missed dose, you may take the pill. Excess Tenormin can cause dizziness, significantly lower your blood pressure and slow your heart rate. To ensure that you have good control of your blood pressure, order tenormin online for faster service.