Mild side effects were observed in 18 of 189 dogs (%) and 8 of 85 cats (%) administered Droncit Injectable in field trials. For dogs the majority of these were described as brief pain responses following injections to larger dogs (weighing over 50 lbs.). Two dogs exhibited a brief period of mild vomiting and/or drowsy or staggering gait. The eight cats exhibited either diarrhea, weakness, vomition, salivation, sleepiness, burning on injection and/or a temporary lack of appetite. Local irritation or swelling at the site of subcutaneous injections have been reported for cats.
Particularly for intravenous administration, self-injection in the arm can be awkward, and some people modify a syringe for single-handed operation by removing the plunger and affixing a bulb such as from a large dropper or baby pacifier to the end of the barrel to in effect make it a large dropper with a needle affixed. This is therefore a variant of the common method of injection with a dropper with the hypodermic needle affixed, using a "collar" made of paper or other material to create a seal between the needle and dropper. Removing part of the plunger assembly by cutting off most of the shaft and thumb rest and affixing the bulb to the end of the barrel, thereby allowing the bulb to operate the plunger by suction, also does work in many cases.
For this reason the first injection is usually given during the first 1-5 days of a period. If you have the injection within five days of starting a period, you will be protected immediately. Further injections are then given up to 13 weeks apart, depending on the type used. If you are unable to make an appointment within that five-day window, you can have the injection at any time, as long as you are reasonably sure you are not pregnant. Your practice nurse or doctor will advise you to use extra contraception (such as a condom) for seven days after the injection. This is what is called an 'off-label use' and not all practices will allow it.