Zyrtec-D Dosage: An Introduction There is only one recommended dose of Zyrtec-D ® (cetirizine and pseudoephedrine). As is always the case, do not adjust your dose unless your healthcare provider specifically instructs you to do so. Loratadine comes in capsules, tablets, and as syrup. Loratadine should not be given to children under that age 6. You should not take more than 10 milligram (mg), which is one tablet or capsule. Before taking Claritin-D, you should tell your doctor or pharmacist about all prescription, non-prescription, illegal, recreational, herbal, nutritional, or dietary drugs you're taking, especially: Summary. Most individuals do not experience Claritin side effects when they take the medication as directed. While it is a safe medication that is sold over the counter, patients should be aware of all of the possible side effects they may experience during treatment, including dry mouth, drowsiness, jaundice or seizures. You can take them together. Singulair is Montelukast sodium which is a leukotriene receptor antagonist and Claritin is Loratidine which is a piperidine antihistamine. While Claritin is often the leading choice for over the counter antihistamines, depending on your situation and how your body reacts to it, there are a number of other options to choose from. What other drugs will affect Claritin-D? Using Claritin-D with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures. The common cold will usually run its course within 7 to 14 days. There are many natural remedies and over the counter products that are compatible with breastfeeding. Physicians receive little education about breast-feeding and even less training on the effects of maternal medications on the nursing infant.1 Yet, concern about potential harm to the nursing. Y ou’ve done it: you got through your pregnancy without a cold. But something happened, and now you have a cold while breastfeeding. While your body is on the mend and breastfeeding is less intense than carrying a child, this doesn’t mean you can take just any medication.